What Missions Have Been Sent to Mars?

How the Mars Mission Record Is Counted

On October 10, 1960, the Soviet Union launched a small spacecraft intended to fly past Mars. The rocket failed before reaching Earth orbit. That unsuccessful launch began a record that now includes interplanetary flybys, orbiters, atmospheric probes, landers, penetrators, rovers, a helicopter, sample-caching hardware, communications relays, and spacecraft that visited Mars on their way to other destinations.

As of July 17, 2026, humanity has conducted 48 dedicated Mars launch campaigns. The total counts each launch campaign once, even when one rocket carried several flight elements. Mars Express and Beagle 2 count as one launch campaign, for example, as do Mars 2020, Perseverance, and Ingenuity. Individual spacecraft totals are higher because many campaigns contained an orbiter, lander, rover, descent module, relay spacecraft, penetrator, helicopter, or deployable camera.

Five additional missions built for destinations beyond Mars have visited the planet for gravity assists: Rosetta, Dawn, Europa Clipper, Hera, and Psyche. They are treated separately because Mars was a navigation point rather than their primary destination.

The chronology includes spacecraft that failed during launch, remained trapped near Earth, lost communications during cruise, missed orbital insertion, crashed during descent, landed without establishing communications, or ended before completing their planned science. Excluding those missions would present an incomplete account of how Mars exploration developed. Failed flights exposed weaknesses in rockets, propulsion, software, navigation, testing, management, communications, sensors, power systems, and landing designs. Later spacecraft benefited directly from those lessons.

The mission record can be checked against NASA’s Mars Exploration Timeline, the agency’s Mars Exploration Program, international mission records, and New Space Economy’s history of Mars exploration.

The record also requires careful use of the word “success.” A spacecraft may fail in its central objective yet return useful engineering or scientific data. Mars 6 transmitted measurements during atmospheric descent but apparently crashed. Schiaparelli failed to land safely but returned detailed descent telemetry. Beagle 2 reached the surface and partially deployed, though it never communicated. Phobos 2 entered Mars orbit and observed Phobos before contact ended ahead of its planned landings.

Mars exploration has progressed through accumulated capability rather than a simple succession of triumphs. Flybys established basic facts. Orbiters mapped the planet. Landers measured local environments. Rovers reconstructed ancient geological conditions. Atmospheric missions traced the loss of air and water. Modern spacecraft search for preserved biosignatures and prepare samples that could be examined in laboratories on Earth.

Mars Mission Timeline at a Glance

The table groups the 48 dedicated launch campaigns into broad eras. The detailed chronology that follows identifies every campaign, its flight elements, its objective, and its outcome.

Detailed Mars Mission Timeline

October 1960: Mars 1M No. 1 and Mars 1M No. 2

The Soviet Union opened the Mars mission record with two nearly identical flyby probes. Mars 1M No. 1, commonly called Marsnik 1 or Korabl 4 in Western records, launched on October 10, 1960. It carried equipment intended to photograph Mars and measure interplanetary conditions.

The Molniya launch vehicle experienced severe vibration and a guidance-system failure. Its upper stages did not complete the ascent, and the spacecraft fell back toward Earth without reaching orbit.

Mars 1M No. 2, also called Marsnik 2 or Korabl 5, launched on October 14. The rocket again failed during ascent. A propellant leak and engine malfunction prevented orbital insertion.

Neither spacecraft reached space in the operational sense required for an interplanetary mission. Their importance came from what the Soviet program had attempted. Planetary flight demanded an upper stage capable of operating after an orbital coast, an autonomous probe capable of surviving months away from Earth, and a communications system that could function across tens of millions of kilometers.

The launches occurred before any nation had successfully sent a spacecraft to another planet. They established that Mars exploration would depend as much on rocket reliability and systems integration as on cameras or scientific instruments.

October and November 1962: Sputnik 22, Mars 1, and Sputnik 24

Mars 2MV-4 No. 1, often identified as Sputnik 22, launched on October 24, 1962. The spacecraft reached a temporary Earth orbit, but its Block L departure stage broke apart before performing the burn toward Mars. Debris was tracked in orbit, and the probe never escaped Earth.

Mars 1 launched on November 1 and successfully entered interplanetary space. It carried instruments for measuring cosmic rays, magnetic fields, micrometeoroids, solar plasma, and radiation. The spacecraft returned data for several months, making it the Soviet program’s earliest functioning probe on a Mars transfer path.

A failure in its orientation system caused contact to end on March 21, 1963. Mars 1 continued along its solar orbit and passed the planet in June, but it could not return encounter data.

Mars 2MV-3 No. 1, commonly called Sputnik 24, launched on November 4. Its payload included a descent vehicle intended to reach the Martian surface. The departure stage failed, leaving the spacecraft stranded in low Earth orbit until it reentered.

These missions showed progress beyond the 1960 attempts. Two spacecraft reached Earth orbit, and Mars 1 escaped Earth completely. The program still lacked the propulsion reliability, orientation control, navigation accuracy, and communications endurance required for a productive Mars encounter.

November 1964: Mariner 3, Mariner 4, and Zond 2

NASA launched Mariner 3 on November 5, 1964. A protective launch shroud failed to separate, trapping the spacecraft’s solar panels. The added mass also prevented the intended Mars path. Battery power declined, and communications ended.

Engineers redesigned the shroud before launching Mariner 4 on November 28. The spacecraft passed Mars on July 15, 1965, and returned 21 complete images plus part of another frame.

Those photographs showed a cratered region that resembled the Moon more than the Earthlike Mars presented in some earlier literature. Mariner 4 measured a thin atmosphere dominated by carbon dioxide and found no global magnetic field comparable to Earth’s.

The photographed terrain represented a small part of Mars, yet the observations sharply reduced expectations of canals, large bodies of surface water, or visible vegetation. Planetary science had acquired direct evidence that telescopic interpretations could not provide.

The Soviet Union launched Zond 2 on November 30. Its experimental plasma-electric thrusters operated during cruise, but communications weakened and ended before arrival. The silent spacecraft passed near Mars in August 1965.

Mariner 4 achieved a functioning planetary encounter. Zond 2 demonstrated that an otherwise viable path could still produce no science when communications failed. Both outcomes directed attention toward antenna pointing, power, redundancy, thermal control, and long-duration operations.

February to April 1969: Mariner 6, Mars 1969A, Mariner 7, and Mars 1969B

NASA launched Mariner 6 on February 25, 1969. It passed Mars on July 31 and returned 75 images. Its instruments examined equatorial regions, the southern hemisphere, atmospheric temperature, pressure, and composition.

The Soviet Mars 2M No. 521, usually called Mars 1969A, launched on March 27. A malfunction in the Proton launch vehicle caused an explosion shortly after liftoff. The orbiter never reached Earth orbit.

Mariner 7 also launched on March 27. It passed Mars on August 5 and returned 126 images, including observations of the southern polar region. Its instruments worked with those aboard Mariner 6 to measure surface temperatures and atmospheric properties.

Controllers briefly lost communications with Mariner 7 during cruise. The spacecraft began tumbling after a battery-related event, but the operations team restored control and completed the encounter. That recovery offered an early example of diagnosing a distant spacecraft with limited telemetry.

Mars 2M No. 522, commonly called Mars 1969B, launched on April 2. Another Proton failure destroyed the spacecraft before orbit.

Mariner 6 and Mariner 7 formed NASA’s inaugural successful dual mission to Mars. The paired spacecraft supplied broader geographical coverage, operational redundancy, and comparable measurements. Their results still portrayed a cold, dry planet, but the limited flyby strips could not reveal the global geological diversity that later orbiters found.

May 1971: Mariner 8, Kosmos 419, Mars 2, Mars 3, and Mariner 9

Mariner 8 launched on May 9, 1971 UTC, as one of two American Mars orbiters. A launch guidance failure caused the vehicle to tumble, and the spacecraft fell into the Atlantic Ocean.

The Soviet Union launched Mars 3MS No. 170, publicly designated Kosmos 419 after it remained near Earth, on May 10. A timer was programmed incorrectly, preventing the departure stage from firing at the proper time. The spacecraft reentered Earth’s atmosphere two days later.

Mars 2 launched on May 19 with an orbiter, descent module, and small PrOP-M rover. The orbiter entered a highly elliptical Mars orbit on November 27 and transmitted images and measurements of the atmosphere, magnetic environment, radiation, and surface.

The descent module approached too steeply, failed to slow as intended, and struck the surface. It became the earliest human-made object known to reach Mars, though it did so in a crash. The rover could not deploy.

Mars 3 launched on May 28 with a similar combination of orbiter, lander, and rover. The lander descended through an immense dust storm and achieved a soft landing on December 2.

A signal reached Earth for about 20 seconds before communications ended. A partial transmission did not produce a usable surface view. The PrOP-M rover probably never began operations.

The Mars 3 orbiter entered an unintended long-period orbit because it lacked enough propellant for the planned maneuver. It still returned scientific measurements. Mars 2 and Mars 3 operated in orbit until August 1972.

NASA launched Mariner 9 on May 30. It entered orbit on November 14, becoming the earliest spacecraft to orbit another planet successfully.

A global dust storm concealed the surface when Mariner 9 arrived. Mission controllers postponed much of the mapping program and watched the storm change. As the atmosphere cleared, the spacecraft revealed Olympus Mons, Valles Marineris, enormous channels, layered polar deposits, volcanoes, canyons, and weather systems.

Mariner 9 returned 7,329 images and mapped about 85% of Mars. The observations showed that the cratered terrain seen by Mariner 4 represented only part of the planet. Mars had experienced volcanism, erosion, crustal deformation, atmospheric activity, and large-scale movement of water.

The 1971 launch window produced the earliest successful Mars orbiter, the earliest impact on the planet, and the earliest brief soft landing. It also produced two launch failures and a surface station that survived for seconds. That mixture captures the character of early Mars exploration more accurately than a simple list of successful milestones.

July and August 1973: Mars 4, Mars 5, Mars 6, and Mars 7

The Soviet Union launched four spacecraft during the 1973 opportunity. A defective electronic component affected the campaign, limiting operations even when spacecraft reached Mars.

Mars 4 launched on July 21 as an orbiter. Its braking engine did not fire during arrival on February 10, 1974. The spacecraft missed orbital capture and passed about 2,200 kilometers above Mars.

Mars 4 returned a limited set of images and measurements during the flyby. It continued transmitting from solar orbit for a period after the encounter.

Mars 5 launched on July 25 and entered orbit on February 12, 1974. It completed 22 orbits and returned about 60 images, along with atmospheric and surface measurements. A loss of pressure ended the mission after only a few weeks.

Mars 6 launched on August 5 with a flyby carrier and descent module. The lander separated successfully and entered the atmosphere on March 12, 1974. It transmitted data for 224 seconds during descent.

Contact ended near the surface, either during retrorocket firing or at impact. Much of the returned data was corrupted by the electronics defect, yet Mars 6 supplied direct measurements from within the atmosphere.

Mars 7 launched on August 9 with another descent module. A malfunction caused the lander to separate several hours too early. It missed Mars by roughly 1,300 kilometers and entered solar orbit.

The 1973 program produced a short-lived orbiter, two unplanned flybys, one atmospheric descent, and no functioning surface station. Shared spacecraft hardware lowered development costs, but a common defect placed the full campaign at risk.

August and September 1975: Viking 1 and Viking 2

Viking 1 launched on August 20, 1975, carrying an orbiter and a lander. The orbiter reached Mars on June 19, 1976. NASA delayed landing until imagery supported selection of a safer site in Chryse Planitia.

The lander touched down on July 20 and returned a panoramic image soon afterward. It measured weather, chemistry, surface properties, and seismic conditions. Three biology experiments tested for possible microbial activity.

Those experiments produced responses that remain subjects of scientific discussion. NASA concluded that the results did not establish the presence of life. Later knowledge about reactive Martian soil, perchlorates, radiation, and organic preservation complicated interpretations of what the experiments measured.

The Viking 1 orbiter mapped Mars, monitored weather, certified landing areas, and relayed data. It operated until August 1980. The lander continued until November 1982, when a command sequence unintentionally ended communications.

Viking 2 launched on September 9, entered orbit on August 7, 1976, and landed in Utopia Planitia on September 3. Its northern location displayed seasonal frost and environmental conditions different from the Viking 1 site.

The Viking 2 orbiter operated until July 1978. Its lander transmitted until April 1980. Together, the Viking spacecraft returned more than 50,000 images and mapped most of the planet at useful resolution.

Viking established sustained science from both orbit and the surface. It also affected later mission strategy. After the biology experiments failed to provide accepted evidence of organisms, agencies concentrated on water, habitability, geology, climate, and preservation before planning new life-detection experiments.

The transition from Viking’s direct biology work to modern biosignature studies is explored further in New Space Economy’s examination of the possibility of life on Mars.

July 1988: Phobos 1 and Phobos 2

Phobos 1 launched on July 7, 1988. The Soviet spacecraft was designed to enter Mars orbit, study the planet and solar environment, approach Phobos, and deploy landing packages.

A mistaken ground command disabled attitude-control functions during cruise. The spacecraft lost its orientation toward the Sun, exhausted its batteries, and stopped communicating on September 2.

Phobos 2 launched on July 12 and entered Mars orbit in January 1989. It returned images and measurements of Mars, the solar wind, and Phobos. Mission controllers gradually adjusted its orbit for close operations near the moon.

Contact ended on March 27 before the planned stationary lander and hopping vehicle could deploy. Phobos 2 returned 37 images of the moon and completed part of its orbital science, making it a partial success rather than a total loss.

The Phobos program included substantial international scientific participation. It represented a return to complex Soviet planetary exploration after a 15-year pause in Mars launches.

The outcomes showed that launch and orbital insertion did not eliminate operational risk. A ground-command error destroyed Phobos 1, and an unexplained spacecraft failure ended Phobos 2 shortly before its most ambitious work.

September 1992: Mars Observer

Mars Observer launched on September 25, 1992. NASA adapted elements of an Earth-orbiting commercial spacecraft design for a mission intended to map Mars’s minerals, topography, magnetic field, gravity, atmosphere, and climate.

Contact ended on August 21, 1993, three days before planned orbital insertion. Investigators considered a fuel-system rupture during pressurization the most likely explanation, though the spacecraft transmitted too little information to establish the precise sequence.

Mars Observer carried an unusually concentrated set of scientific objectives. Its loss removed most of NASA’s planned Mars science for the decade in one event.

NASA chose not to rebuild the complete spacecraft. Instruments, designs, and objectives were distributed across smaller missions, including Mars Global Surveyor and Mars Odyssey.

The loss influenced a period of lower-cost planetary missions, more frequent launches, and narrower objectives. Distribution reduced the chance that one failure could erase a full scientific program, though the later Mars Surveyor failures showed that smaller missions still required extensive testing and oversight.

November and December 1996: Mars Global Surveyor, Mars 96, and Mars Pathfinder

Mars Global Surveyor launched on November 7, 1996, and entered orbit on September 12, 1997. A damaged solar panel forced engineers to conduct aerobraking more cautiously, delaying the full mapping mission.

The spacecraft produced a global elevation model, mapped thermal properties and minerals, measured gravity and magnetic fields, and recorded weather and surface changes. Its laser altimeter data became a basic reference for Martian cartography.

Mars Global Surveyor found magnetized ancient crust, indicating that early Mars once possessed an internal magnetic dynamo. Its camera also identified layered terrains, gullies, dust-devil tracks, dunes, impact sites, and changes that occurred during the mission.

Contact ended in November 2006 after a command and orientation sequence left the spacecraft unable to maintain power and communications. The orbiter had worked for more than nine years at Mars.

Russia launched Mars 96 on November 16, 1996. The mission contained an orbiter, two small surface stations, and two penetrators carrying instruments from Russia and several European countries.

The Proton rocket reached an initial orbit, but the departure stage malfunctioned. Mars 96 reentered Earth’s atmosphere without beginning its interplanetary journey.

Some European instrument concepts and scientific objectives later appeared on Mars Express. The failure also demonstrated the financial and institutional difficulties facing Russia’s planetary program after the Soviet Union dissolved.

Mars Pathfinder launched on December 4 and landed in Ares Vallis on July 4, 1997. Its entry system combined a heat shield, parachute, retrorockets, and airbags.

The lander bounced and rolled before opening its petals. The small Sojourner rover then drove onto the surface, becoming the earliest wheeled vehicle to operate on another planet.

Sojourner examined rocks and soil, tested autonomous navigation, and demonstrated mobility under delayed communications. The stationary lander supplied imaging, weather measurements, and the communications link between the rover and Earth.

Pathfinder operated until September 27, far beyond its planned primary mission. It restored confidence after Mars Observer and proved that a lower-cost mission could demonstrate new technology and return valuable science.

The airbag system later carried Spirit and Opportunity to the surface. Pathfinder’s operational legacy is covered in New Space Economy’s Mars Pathfinder mission review.

July 1998 to January 1999: Nozomi, Mars Climate Orbiter, and Mars Polar Lander

Japan launched Nozomi, originally called Planet-B, on July 3, 1998. It was intended to enter a highly elliptical orbit and study the upper atmosphere, ionosphere, solar wind, and atmospheric escape.

A malfunction during an Earth gravity-assist maneuver consumed more propellant than planned. Controllers developed a revised route, but a solar eruption and electrical problems caused further damage.

Japan abandoned Mars orbital insertion in December 2003. Nozomi passed the planet at a safe distance and continued into solar orbit. It returned useful information about the interplanetary environment, yet it could not perform its Mars science program.

Mars Climate Orbiter launched on December 11, 1998. It was designed to study climate, weather, dust, water, and atmospheric circulation. It would also relay data from Mars Polar Lander.

The orbiter was lost during arrival on September 23, 1999. One engineering group supplied thruster impulse data in pound-force seconds, but navigation software expected newton seconds.

The mismatch caused navigation estimates to diverge from the spacecraft’s actual path. Mars Climate Orbiter entered much lower than planned and was destroyed in the atmosphere or escaped into an unknown solar orbit.

Mars Polar Lander launched on January 3, 1999. It carried a lander intended to investigate the southern polar region and two Deep Space 2 penetrators named Amundsen and Scott.

Communications ended during descent on December 3. Investigators concluded that vibrations from landing-leg deployment may have produced a false touchdown indication, causing the engines to shut down above the surface.

The penetrators separated before atmospheric entry and were designed to strike Mars at high speed. Neither transmitted after arrival.

The losses triggered broad reviews of NASA’s Mars program. Mission teams strengthened independent verification, interface control, software testing, risk assessment, communications planning, and management accountability.

Mars landing remained demanding because the atmosphere is thick enough to create severe heating but too thin for parachutes alone to land large spacecraft. The history of these systems is examined in New Space Economy’s Mars landing chronology.

April 2001: Mars Odyssey

2001 Mars Odyssey launched on April 7, 2001, and entered Mars orbit on October 24. It used atmospheric drag over many passes to reshape its initial orbit into the lower, nearly circular path needed for science.

Its gamma-ray spectrometer detected large concentrations of hydrogen beneath broad high-latitude regions. Scientists interpreted much of that hydrogen as water ice mixed with or buried beneath the soil.

The Thermal Emission Imaging System mapped temperatures, minerals, rock abundance, frost, clouds, and surface properties. These observations supported geological research and landing-site evaluation.

Odyssey also carried a radiation experiment that measured energetic particles during the journey and near Mars. The results contributed to assessments of hazards facing future crews.

The orbiter became a communications relay for Spirit, Opportunity, Phoenix, Curiosity, InSight, and Perseverance. Surface missions can transmit to a nearby orbiter at higher rates than they normally achieve through a direct Earth link.

As of July 17, 2026, Odyssey remains operational. It has completed more than 100,000 Mars orbits and holds the longevity record for a continuously active spacecraft at another planet.

Its continued operation has scientific and infrastructure value. Weather observations, thermal mapping, landing support, and communications remain available more than two decades after its planned primary mission.

June and July 2003: Mars Express, Spirit, and Opportunity

The European Space Agency launched Mars Express on June 2, 2003. It entered orbit on December 25 and became Europe’s inaugural independent planetary mission.

Its instruments study geology, mineralogy, atmospheric composition, plasma conditions, water, polar deposits, and the Martian moons. The MARSIS radar examines subsurface layers and ice-rich regions.

Mars Express mapped minerals formed through interaction with water and observed atmospheric gases, clouds, dust, auroras, and escape processes. It also conducted repeated close observations of Phobos.

The orbiter carried the British-led Beagle 2 lander, which separated on December 19. No signal arrived after its scheduled December 25 landing, and the lander was considered lost.

Images taken years later by Mars Reconnaissance Orbiter showed Beagle 2 on the surface. The evidence indicated that it landed and partially deployed, but one or more solar panels did not open fully. The blocked configuration probably prevented its antenna from communicating.

Mars Express remains operational as of July 17, 2026. It has become both a science platform and a communications relay for other surface missions.

NASA launched Spirit on June 10, 2003. The rover landed in Gusev Crater on January 4, 2004, using a parachute, rockets, and airbags derived from Pathfinder.

Spirit was designed for 90 Martian days but worked for more than six Earth years. It found volcanic rocks altered by water, silica-rich materials associated with hydrothermal conditions, and soils transformed by past chemical activity.

One front wheel stopped working in 2006. Controllers drove the rover backward, and the dragging wheel exposed subsurface material that became scientifically useful.

Spirit became embedded in soft soil in 2009. The rover could not obtain a favorable winter orientation, and its final communication arrived on March 22, 2010.

Opportunity launched on July 7, 2003, and landed at Meridiani Planum on January 25, 2004. It came to rest inside a small crater containing exposed layered bedrock.

The rover found sulfate minerals, sedimentary structures, hematite-rich spheres, and chemical evidence that liquid water had altered the site. Some ancient environments were acidic and salty. Later observations near Endeavour Crater found clay minerals formed under more neutral conditions.

Opportunity traveled 45.16 kilometers and operated for almost 15 years. A planet-encircling dust storm blocked sunlight in 2018, and its final signal arrived on June 10.

NASA ended recovery efforts in February 2019. Opportunity set enduring records for surface distance and mission life on Mars.

Spirit and Opportunity changed rover operations from brief demonstrations into sustained geological fieldwork. Their scientific and engineering legacy appears within New Space Economy’s history of Mars rovers.

August 2005: Mars Reconnaissance Orbiter

Mars Reconnaissance Orbiter launched on August 12, 2005, and entered orbit on March 10, 2006. Aerobraking gradually produced the low-altitude science orbit required for detailed observations.

Its High Resolution Imaging Science Experiment can resolve features roughly the size of a dining table under favorable conditions. The camera has photographed dunes, layered deposits, gullies, impact craters, polar terrain, rover tracks, landing hardware, avalanches, dust devils, and seasonal changes.

A mineral-mapping spectrometer identified clays, salts, carbonates, and other materials connected with ancient water. A shallow radar examined subsurface structures, buried ice, and polar layers.

The orbiter also monitors weather and atmospheric temperatures. Its observations guide rover routes and help scientists connect local surface measurements with regional geology.

Mars Reconnaissance Orbiter photographed Phoenix, Curiosity, InSight, and Perseverance during descent or after landing. It documented Beagle 2’s partial deployment and located many pieces of surface hardware.

Its relay system has returned immense quantities of data from landers and rovers. This infrastructure function has become as important as its science mission.

As of July 17, 2026, Mars Reconnaissance Orbiter remains active. Its age raises long-term planning concerns because newer surface missions depend heavily on communications spacecraft launched many years earlier.

NASA has begun examining new commercial relay approaches, a development discussed in New Space Economy’s coverage of the Mars Telecommunications Network.

August 2007: Phoenix

Phoenix launched on August 4, 2007, and landed in the northern plains on May 25, 2008. It used hardware derived from the canceled Mars Surveyor 2001 lander.

The lander carried a robotic arm, cameras, microscopes, chemistry instruments, ovens, and weather sensors. Its arm dug trenches through the surface soil and exposed bright material.

Some exposed material disappeared over several days, supporting its identification as water ice. Phoenix directly confirmed shallow subsurface ice at its landing site.

The lander detected perchlorate salts. Perchlorates affect water’s freezing behavior, soil chemistry, organic preservation, life-detection experiments, and possible use of local resources by future missions.

Phoenix observed clouds, frost, pressure changes, dust, and snowfall from the atmosphere. It operated beyond its planned 90-sol mission.

Declining sunlight and the onset of the northern winter reduced power. Communications ended on November 2, 2008. Orbital images later showed changes to the lander consistent with winter carbon dioxide ice loading.

Phoenix demonstrated that high-latitude ice could be sampled directly. Its results connected modern climate cycles with buried water and added new chemical complications to the search for organic compounds.

November 2011: Phobos-Grunt, Yinghuo-1, and Curiosity

Russia launched Phobos-Grunt on November 8, 2011. The ambitious spacecraft was intended to land on Phobos, collect a sample, launch it from the moon, and return it to Earth.

The spacecraft reached low Earth orbit, but its interplanetary propulsion system did not perform the departure burns. Controllers could not restore command, and Phobos-Grunt reentered in January 2012.

China’s Yinghuo-1 orbiter traveled as a passenger aboard Phobos-Grunt. It was intended to separate near Mars and study plasma conditions, atmospheric escape, magnetic fields, and the interaction between the solar wind and the planet.

Because the combined spacecraft never left Earth orbit, Yinghuo-1 could not begin independent operations. China later developed Tianwen-1 as an independent Mars mission.

NASA launched the Mars Science Laboratory on November 26. Its Curiosity rover was far heavier than the earlier Mars Exploration Rovers.

Curiosity landed in Gale Crater on August 6, 2012, using guided atmospheric entry, a supersonic parachute, powered descent, and a sky-crane system. The descent stage lowered the rover onto its wheels before flying away.

The rover found that Gale Crater once contained lakes and streams with liquid water, carbon-bearing compounds, chemical energy sources, and environmental conditions compatible with microbial life.

Curiosity detected organic molecules preserved in ancient mudstone. It also measured radiation, weather, methane changes, mineral transformations, and the layered geological history of Mount Sharp.

Its nuclear power system permits work during low sunlight and dusty seasons. As of July 17, 2026, Curiosity remains active and continues examining the transition from wetter ancient environments to the dry conditions that followed.

Curiosity did not establish that life existed on Mars. It showed that at least one ancient environment possessed conditions that could have supported microorganisms.

November 2013: Mangalyaan and MAVEN

India launched the Mars Orbiter Mission, commonly called Mangalyaan, on November 5, 2013. The spacecraft used repeated Earth-orbit-raising maneuvers before departing for Mars.

It entered Mars orbit on September 24, 2014. India became the earliest Asian country to place a spacecraft in Martian orbit and achieved that result during its inaugural independent Mars campaign.

Mangalyaan demonstrated interplanetary navigation, deep-space communications, autonomy, propulsion, and mission operations. Its instruments observed surface features, dust, atmospheric properties, and the extended hydrogen and deuterium environment.

The spacecraft had a planned life of six months but operated for about eight years. A long eclipse and depleted propellant contributed to the loss of communications in April 2022. The Indian Space Research Organisation later declared the mission complete.

NASA launched MAVEN on November 18, 2013. The spacecraft entered orbit in September 2014 and studied the upper atmosphere, ionosphere, solar wind, magnetic environment, and atmospheric escape.

Its observations showed how solar radiation and storms remove particles from the atmosphere. The measurements helped explain how early Mars could lose much of its air and surface water.

MAVEN detected different forms of Martian aurora, measured atmospheric sputtering, studied water loss during dust storms, and relayed data from surface missions.

Contact ended on December 6, 2025, after the spacecraft passed behind Mars. NASA’s Deep Space Network detected evidence that MAVEN was rotating rapidly and had lost power.

NASA declared the mission complete on June 3, 2026. MAVEN had operated for more than 11 years at Mars and produced an extensive atmospheric record.

March 2016: Trace Gas Orbiter and Schiaparelli

The European Space Agency and Roscosmos launched the ExoMars 2016 mission on March 14. It carried the Trace Gas Orbiter and the Schiaparelli descent demonstrator.

The Trace Gas Orbiter entered Mars orbit on October 19. It later spent about a year using atmospheric drag to reach its lower science orbit.

Its instruments examine trace gases, atmospheric chemistry, water, dust, surface composition, and subsurface hydrogen. Methane has received close attention because it can originate through geological or biological processes.

The orbiter has not detected methane at concentrations matching some earlier observations. The disagreement remains unresolved and may involve localized sources, seasonal release, measurement differences, or atmospheric destruction processes.

The spacecraft also carries a communications relay intended to support surface missions. As of July 17, 2026, the Trace Gas Orbiter remains operational.

Schiaparelli separated from the orbiter and entered the atmosphere on October 19. Its heat shield and parachute performed much of the descent sequence.

A brief saturation of its inertial measurement system led navigation software to calculate an impossible altitude below the surface. The parachute and backshell were released too early, and the engines shut down after firing for only a few seconds.

Schiaparelli fell several kilometers and struck the surface. It transmitted engineering information through much of its descent, allowing investigators to reconstruct the failure.

The mission did not achieve a safe landing, but its telemetry influenced the redesign and testing of Europe’s later Rosalind Franklin landing system.

May 2018: InSight and Mars Cube One

InSight launched on May 5, 2018, and landed in Elysium Planitia on November 26. The mission studied Mars’s interior rather than traveling across its surface.

Its seismometer detected more than 1,300 seismic events. Marsquakes and meteoroid impacts helped researchers estimate the thickness and structure of the crust, properties of the mantle, and dimensions of the core.

A radio experiment measured small changes in the planet’s rotation. Weather instruments recorded pressure, wind, temperature, and dust activity. A magnetometer detected unexpected crustal magnetic fields at the landing site.

The Heat Flow and Physical Properties Package included a self-hammering probe called the mole. It was intended to reach several meters below the surface.

Unexpected soil behavior prevented the probe from developing enough friction to dig deeply. Engineers used the robotic arm in repeated attempts to assist it, but the instrument never reached its planned depth.

Dust accumulation reduced solar power over several years. NASA declared the mission complete in December 2022 after the lander stopped communicating.

Two small spacecraft called Mars Cube One launched with InSight. MarCO-A and MarCO-B navigated independently to Mars and relayed telemetry during the landing.

The CubeSats were not required for InSight’s success. They demonstrated that small spacecraft could conduct interplanetary navigation, operate far from Earth, and support communications during a planetary arrival.

Both passed Mars and continued into solar orbit. Their demonstration encouraged proposals for distributed missions made from smaller and less expensive spacecraft.

July 2020: Hope

The United Arab Emirates launched the Emirates Mars Mission, carrying the Hope probe, on July 19, 2020 UTC. Hope entered orbit on February 9, 2021.

Its high, elliptical orbit provides observations across large areas and different local times. Lower orbiters often pass over a location at nearly the same local time on each orbit.

Hope studies daily and seasonal weather, clouds, dust, temperature, water vapor, atmospheric circulation, and the escape of hydrogen and oxygen. It links processes in the lower atmosphere with those in the upper atmosphere.

The spacecraft has also observed discrete auroras and supplied data to researchers through an open science program.

The mission made the United Arab Emirates the earliest Arab country to operate an interplanetary spacecraft. It supported national objectives involving engineering, science education, research institutions, international partnerships, and workforce development.

As of July 17, 2026, Hope remains an active Mars orbiter. Its mission illustrates how a focused science objective and international technical cooperation can enable a newer planetary program to make a distinct contribution.

July 2020: Tianwen-1 and Zhurong

China launched Tianwen-1 on July 23, 2020. The mission combined an orbiter, entry capsule, lander, Zhurong rover, and deployable cameras.

Tianwen-1 entered orbit on February 10, 2021. The orbiter spent several months imaging and assessing the planned landing region in Utopia Planitia.

The lander and rover reached the surface on May 14 UTC. China became the second country to operate a rover successfully on Mars.

Zhurong carried cameras, weather sensors, a magnetic-field instrument, a surface-composition instrument, and ground-penetrating radar. It examined rocks, soil, dunes, weather, and subsurface layering.

The rover traveled more than 1.9 kilometers before entering a planned dormant state in May 2022 during the cold and dusty northern winter.

Zhurong did not resume communications. Dust accumulation may have prevented its solar arrays from producing enough power, though China has not published a complete failure reconstruction.

Radar observations supplied evidence of subsurface layers and geological change in Utopia Planitia. Interpretations involving ancient water remain subjects of continuing research.

The Tianwen-1 orbiter conducted global imaging, mineral mapping, atmospheric observations, magnetic measurements, and relay operations. Deployable cameras photographed the spacecraft during cruise and in Mars orbit.

As of July 17, 2026, current mission catalogues continue to identify the Tianwen-1 orbiter as operational. Zhurong is not considered active.

Tianwen-1 achieved orbital insertion, landing, and rover deployment during China’s inaugural independent Mars campaign. Its place within the wider program is described in New Space Economy’s Tianwen program history.

July 2020: Perseverance and Ingenuity

NASA launched Mars 2020 on July 30, 2020. The mission carried the Perseverance rover and the Ingenuity helicopter.

Perseverance landed in Jezero Crater on February 18, 2021. Its entry system used an improved sky crane and terrain-relative navigation.

Terrain-relative navigation compared images taken during descent with an onboard map. The system could identify hazards and redirect the spacecraft toward a safer location.

Jezero once contained a lake and river delta. Perseverance studies sediments, igneous rocks, alteration minerals, surface processes, possible biosignatures, weather, and the environmental history preserved around the crater.

The rover drills cylindrical cores and seals selected material in titanium tubes. Some tubes were placed in a backup depot on the surface, and others remain aboard the rover.

Its instruments include high-resolution cameras, spectrometers, a subsurface radar, weather sensors, microphones, and a technology experiment called MOXIE. MOXIE produced oxygen from atmospheric carbon dioxide.

The oxygen experiment demonstrated a process that could support breathing supplies or oxidizer production during future human missions. It was a limited technology demonstration rather than a full-scale production system.

Ingenuity weighed about 1.8 kilograms and was originally assigned five demonstration flights. It achieved powered, controlled flight on April 19, 2021.

The helicopter completed 72 flights and traveled more than 17 kilometers. After its demonstration phase, it scouted terrain and supplied images that supported rover planning.

Damage to its rotor blades during a January 2024 landing ended flight operations. Ingenuity continued limited stationary work after it could no longer fly.

The helicopter proved that aircraft can operate in the thin Martian atmosphere. Its success influenced concepts for larger helicopters, scouts, sample-recovery aircraft, and access to terrain that wheeled vehicles cannot cross.

As of July 17, 2026, Perseverance remains active. Its sample collection forms the physical starting point for proposed Mars Sample Return architectures.

November 2025: ESCAPADE

NASA’s ESCAPADE mission launched on November 13, 2025, aboard Blue Origin’s New Glenn rocket. ESCAPADE stands for Escape and Plasma Acceleration and Dynamics Explorers.

The mission consists of two nearly identical spacecraft named Blue and Gold. They examines how the solar wind interacts with Mars’s induced magnetic environment and drives atmospheric loss.

Two spacecraft can measure different locations at the same time. This allows scientists to distinguish changes caused by time from differences caused by position.

ESCAPADE did not depart directly for Mars after launch. Blue and Gold entered an Earth-proximity path associated with the region around the Sun-Earth L2 point.

The spacecraft are scheduled to return near Earth in November 2026 and use an Earth gravity assist to begin the main Mars transfer. Arrival is planned for September 2027.

As of July 17, 2026, both spacecraft are active in their Earth-proximity phase. They have not yet performed the Earth flyby or entered a Mars-bound interplanetary cruise.

If the mission reaches Mars, Blue and Gold will enter broad capture orbits before moving into their science configuration. Science operations are planned to begin in 2028.

ESCAPADE tests a model based on smaller spacecraft, a concentrated science objective, commercial launch services, and coordinated measurements. Its final outcome cannot be judged before the orbiters reach Mars and begin operations.

Mars Gravity-Assist Visitors

February 2007: Rosetta and Philae

The European Space Agency launched Rosetta on March 2, 2004, for comet 67P/Churyumov-Gerasimenko. The spacecraft flew about 250 kilometers above Mars on February 25, 2007.

Mars’s gravity changed Rosetta’s solar orbit and helped direct it toward later Earth encounters and its comet destination. The maneuver reduced the propellant required for the journey.

Rosetta’s cameras and instruments observed Mars during the flyby. The attached Philae lander also photographed the planet and parts of the spacecraft.

Rosetta later entered orbit around its comet and deployed Philae in 2014. The Mars encounter was a navigation event with added scientific and engineering value rather than a dedicated Mars investigation.

February 2009: Dawn

NASA’s Dawn mission launched in September 2007 to explore Vesta and Ceres. It passed about 549 kilometers above Mars on February 17, 2009.

The gravity assist increased Dawn’s orbital energy and redirected the spacecraft toward the asteroid belt. It supplemented the mission’s solar-electric propulsion system.

Dawn used the encounter for instrument testing, navigation, and limited observation. The spacecraft later became the only mission to orbit two extraterrestrial destinations beyond the Earth-Moon system.

March 2025: Europa Clipper

NASA’s Europa Clipper launched on October 14, 2024, for Jupiter’s moon Europa. It flew about 884 kilometers above Mars on March 1, 2025.

Mars altered the spacecraft’s path toward a later Earth gravity assist. The combination allows Europa Clipper to reach Jupiter without carrying the propellant needed for a direct route.

The spacecraft used Mars to test its thermal imager and radar. The encounter produced infrared observations and allowed engineers to evaluate instrument behavior in flight.

Europa Clipper continued toward an Earth flyby planned for 2026 and Jupiter arrival in 2030.

March 2025: Hera

The European Space Agency launched Hera in October 2024 to investigate the Didymos-Dimorphos asteroid system following NASA’s Double Asteroid Redirection Test.

Hera passed about 5,000 kilometers above Mars on March 12, 2025. The spacecraft also came within roughly 300 kilometers of Deimos.

Mars’s gravity redirected Hera toward its asteroid destination, shortened the trip, and conserved propellant. Cameras and a hyperspectral instrument observed Mars and Deimos.

The encounter gave Hera’s instruments an early scientific target and produced unusually close observations of the outer Martian moon.

May 2026: Psyche

NASA’s Psyche mission launched on October 13, 2023, for the metal-rich asteroid Psyche. It passed 4,609 kilometers above Mars on May 15, 2026.

The encounter increased the spacecraft’s speed by about 1,600 kilometers per hour and changed the angle of its orbit. Those changes placed Psyche on the required course for arrival at its asteroid in 2029.

The spacecraft used the flyby to calibrate cameras, a magnetometer, a gamma-ray and neutron spectrometer, and communications equipment.

Psyche returned images of Mars and observations of its magnetic and surface environment. It had completed the encounter and resumed its asteroid journey by July 17, 2026.

Patterns Across Six Decades of Mars Exploration

Mars missions frequently fail during transitions between operating states. Launch, departure from Earth orbit, cruise correction, orbital insertion, atmospheric entry, parachute release, powered descent, landing, deployment, and surface activation each demand a new configuration.

Early losses concentrated around launch vehicles and upper stages. Mars 1M No. 1, Mars 1M No. 2, Sputnik 22, Sputnik 24, Mars 1969A, Mars 1969B, Mariner 8, Kosmos 419, Mars 96, and Phobos-Grunt never began successful journeys to Mars.

Cruise created a different set of hazards. Mars 1 and Phobos 1 lost orientation or communications. Zond 2 reached the Martian vicinity without a working radio link. Nozomi remained functional for years but could not recover from propulsion and electrical problems.

Arrival magnifies small errors. Mars Climate Orbiter approached the planet on the wrong path because software interfaces used incompatible measurement units. Schiaparelli’s navigation system accepted an impossible altitude. Mars Polar Lander may have interpreted landing-leg movement as touchdown.

Deployment can determine whether a mechanically successful landing becomes an operational mission. Beagle 2 reached the surface, but incomplete solar-panel deployment probably blocked its antenna. Mars 3 landed and transmitted briefly, yet no useful surface science followed.

Mars imposes demanding atmospheric conditions. Its air is dense enough to create heating and aerodynamic forces but too thin for parachutes alone to land heavy vehicles. Landing systems must combine aeroshells, heat shields, parachutes, rockets, radar, cameras, inertial sensors, airbags, legs, or sky cranes.

Engineering inheritance has reduced risk. Pathfinder demonstrated airbags and rover deployment. Spirit and Opportunity expanded that design. Phoenix reused hardware associated with a canceled lander. InSight adapted the Phoenix platform. Perseverance inherited much of Curiosity’s chassis and descent system.

Science instruments also descend from earlier programs. Objectives lost with Mars Observer were divided among later orbiters. European instruments affected by Mars 96 reappeared in later projects. Technologies tested by Mars Cube One influenced concepts for small interplanetary spacecraft.

Communications changed from isolated probes calling Earth directly to a shared relay network. Odyssey, Mars Express, Mars Reconnaissance Orbiter, MAVEN, and the Trace Gas Orbiter have transmitted surface data.

The Earth end of that system relies heavily on NASA’s Deep Space Network, with major antenna complexes in California, Spain, and Australia. Mars spacecraft also use other national and international tracking facilities.

Relay communications permit rovers to return far more information than direct links alone. A rover can send data to an orbiter passing overhead, and the orbiter can transmit to Earth through a larger antenna and more powerful radio system.

This creates operational dependence on aging orbiters. Odyssey launched in 2001, Mars Express in 2003, and Mars Reconnaissance Orbiter in 2005. Their longevity has delivered immense value, but future surface missions need replacement communications capacity.

Participation expanded from a Soviet-American contest into a multinational scientific program. Europe, Japan, India, the United Arab Emirates, and China have launched independent Mars campaigns. Instruments and supporting systems often involve teams from many countries.

National participation does not mean every element is domestically supplied. Launch vehicles, tracking networks, instruments, software, communications support, and scientific investigations may come from partner organizations.

Mission longevity has changed scientific expectations. Viking landers, Mars Global Surveyor, Odyssey, Mars Express, Spirit, Opportunity, Mars Reconnaissance Orbiter, Curiosity, Mangalyaan, MAVEN, and Ingenuity all exceeded their planned primary lifetimes.

Extended missions can observe seasons, dust storms, polar cycles, atmospheric escape, fresh impacts, surface movement, and long-term weather. They also increase the return on launch and development spending.

A long life does not mean unlimited capability. Propellant declines, batteries age, radiation damages electronics, mechanical systems wear, thermal cycles stress structures, and ground hardware becomes obsolete.

Scientific objectives progressed from reconnaissance to environmental reconstruction. Flybys measured basic planetary properties. Orbiters mapped topography and minerals. Landers tested soil and weather. Rovers followed sedimentary layers and water-altered rocks.

Modern exploration concentrates on preserved evidence. Perseverance selects samples with known geological context. Rosalind Franklin is designed to drill below the radiation-damaged surface. Sample-return concepts would transfer selected material to laboratories on Earth.

This progression reflects the difference between detecting habitability and detecting life. Water, organic compounds, chemical energy, and moderate conditions can show that an environment was habitable. They do not prove that organisms occupied it.

A possible biosignature requires geological context, contamination control, several independent measurements, and serious examination of nonbiological explanations. Returned samples would permit repeated testing with instruments too large or power-intensive to place on a rover.

Planetary protection has grown more demanding as missions approach subsurface environments and sample return. New Space Economy’s history of planetary protection explains how contamination concerns affect both outbound spacecraft and material returned to Earth.

Turning Points That Changed Mars Exploration

Mariner 4 replaced distant interpretation with direct images and measurements. Its cratered photographs did not describe the entire planet, but they ended many assumptions about an Earthlike modern surface.

Mariner 9 provided the missing planetary scale. It exposed volcanoes, channels, canyons, layered deposits, polar structures, and changing weather. Mars became a geologically diverse world with a complicated environmental history.

Mars 3 showed that a soft landing was physically possible, even though communications lasted only seconds. The event separated the challenge of reaching the surface from the separate challenge of operating after touchdown.

Viking established long-lived surface science. Its biology experiments did not provide accepted evidence of life, but they defined questions that remain active: how Martian chemistry affects biological tests, where organics can survive, and what evidence would count as persuasive.

Mars Pathfinder demonstrated a new balance among cost, technology testing, mobility, and public engagement. Sojourner showed that a small rover could conduct useful work under delayed control.

Mars Global Surveyor supplied a global elevation and imaging reference. Landing-site planners could compare altitude, slopes, rocks, thermal properties, geology, and atmospheric conditions with far greater precision.

The 1999 losses forced management reform. Mars Climate Orbiter proved that a familiar engineering issue such as inconsistent units can destroy an interplanetary mission. Mars Polar Lander showed how an untested system interaction could defeat a descent sequence.

Odyssey’s hydrogen mapping established that shallow water ice is widespread at high latitudes. Water was no longer understood only through ancient channels or visible polar caps.

Spirit and Opportunity documented several forms of water-related alteration. Their findings showed that Mars experienced environments with different acidity, salinity, temperature, and duration.

Mars Reconnaissance Orbiter transformed landing-site selection. High-resolution images and mineral maps allowed missions to target scientifically rich terrain without accepting the same level of surface hazard.

Curiosity established that an ancient lake environment in Gale Crater had water, organic carbon, chemical energy, and conditions compatible with microbial habitability.

MAVEN connected geological evidence of a wetter past with atmospheric loss measured in the present. Its observations showed how solar activity strips particles and helps change planetary climate over immense periods.

Mangalyaan demonstrated that a smaller program could reach Mars orbit through careful mission design and Earth-orbit maneuvers. Hope later showed that a newer national program could contribute distinctive global atmospheric observations.

Tianwen-1 achieved orbit, landing, and rover operations in one campaign. China joined the United States as a country that had operated a rover on Mars.

Perseverance changed the purpose of surface sampling. Earlier rovers examined material and left it on Mars. Perseverance seals selected cores for possible transport to Earth.

Ingenuity expanded the available forms of movement. Aircraft can cross hazards, inspect routes, reach isolated sites, and survey larger areas than a rover can cover from ground level.

ESCAPADE may demonstrate coordinated planetary measurements using two smaller orbiters. Its place in mission history remains provisional because Blue and Gold have not reached Mars as of July 17, 2026.

Mars Missions Operating as of July 17, 2026

Eight spacecraft are treated as operational at Mars as of July 17, 2026: Mars Odyssey, Mars Express, Mars Reconnaissance Orbiter, Curiosity, the Trace Gas Orbiter, Hope, the Tianwen-1 orbiter, and Perseverance.

Mars Odyssey continues science observations and relay service after almost 25 years at the planet. Its age makes its survival extraordinary, though every extension depends on spacecraft health and available resources.

Mars Express continues examining the surface, subsurface, atmosphere, plasma environment, and Martian moons. It also supports communications and coordinated observations with other orbiters.

Mars Reconnaissance Orbiter remains the primary source of very high-resolution orbital imaging. It supports surface change detection, landing-site analysis, rover route planning, and communications relay.

Curiosity remains active in Gale Crater. Its work focuses on layered rocks that preserve changes in water, climate, sedimentation, and surface chemistry.

The Trace Gas Orbiter continues measuring atmospheric gases, water, dust, surface composition, and subsurface hydrogen. It also serves as a relay platform.

Hope continues atmospheric observations from its elliptical orbit. Its geometry allows broad views across local times and seasons.

The Tianwen-1 orbiter remains listed as operational in current mission catalogues. Zhurong has not communicated since entering dormancy in May 2022.

Perseverance continues its geological investigation and sample-caching work in and beyond Jezero Crater. Ingenuity is no longer capable of flight.

MAVEN is no longer active. NASA declared the mission ended on June 3, 2026, following the December 2025 communications loss.

ESCAPADE is active but is not yet at Mars. Blue and Gold remain in their Earth-proximity phase ahead of a planned Earth gravity assist in November 2026.

The operational fleet is scientifically productive but contains several aging spacecraft. Loss of one relay orbiter can reduce communications opportunities, require changes to rover schedules, and place more demand on the remaining network.

Future Mars infrastructure may involve dedicated relay satellites, commercial services, optical communications, standardized proximity links, and greater autonomy. The distinction between a science spacecraft and an infrastructure spacecraft may become more explicit as surface activity grows.

Missions Planned After July 17, 2026

Japan’s Martian Moons eXploration mission, known as MMX, is intended to enter the Martian system, study Phobos and Deimos, land on Phobos, collect material, and return a sample to Earth.

The mission includes a small rover developed through European cooperation. MMX is planned for launch during Japanese fiscal year 2026, with sample return targeted for 2031. Launch timing remains subject to readiness and mission approval.

Samples from Phobos could help determine whether the moon is a captured asteroid or formed from debris associated with Mars. The material may also contain small fragments ejected from Mars by ancient impacts.

The European Space Agency’s Rosalind Franklin mission is scheduled for launch in late 2028. Its transfer plan would place the rover on Mars in 2030.

Rosalind Franklin is designed to drill as deep as 2 meters. Material at that depth receives greater protection from surface radiation and oxidation, improving the chance that ancient organic compounds remain preserved.

Europe redesigned the mission after cooperation with Roscosmos ended. NASA is supplying launch support, descent engines, heating units, and contributions to the Mars Organic Molecule Analyzer.

China’s Tianwen-3 program is planned as a Mars sample-return campaign. China’s National Space Administration has described a launch around 2028 and return of samples around 2030.

Current plans use a lander and ascent vehicle, a Mars orbiter, an Earth-return element, and international scientific participation. The schedule remains ambitious because no mission has launched a sample container from Mars or returned Martian material to Earth.

NASA and the European Space Agency continue work on Mars Sample Return as a mission concept. NASA announced in January 2025 that it would study two competing landing architectures and expected to choose a path during the second half of 2026.

As of July 17, 2026, NASA had not announced a completed architecture selection through its public mission pages. Cost, schedule, launch vehicles, lander design, the Mars Ascent Vehicle, sample transfer, Earth return, containment, and government funding remain unresolved program issues.

Perseverance has already collected the samples that such a campaign would retrieve. The existence of sealed tubes on Mars does not guarantee that a return campaign will be approved or completed.

India has studied a follow-on mission commonly called Mangalyaan-2. Public concepts have included new orbital instruments and possible atmospheric or surface-supporting elements. No firm launch date or final architecture had been confirmed by July 17, 2026.

The United Arab Emirates’ MBR Explorer is an asteroid-belt mission planned to use a future Mars gravity assist. Mars would serve as a navigation point rather than the primary destination.

Human expeditions remain planning objectives rather than approved flights with fixed launch dates. NASA’s Moon to Mars work, commercial transportation studies, nuclear-power research, life-support development, radiation studies, surface systems, and human Mars mission planning continue without a committed crewed Mars schedule.

Robotic spacecraft would remain necessary before, during, and after any human expedition. Orbiters must provide weather monitoring, communications, navigation, mapping, and emergency support. Surface missions must locate resources, characterize dust and terrain, measure radiation, and test equipment over long periods.

Summary

The complete Mars mission timeline contains 48 dedicated launch campaigns from October 1960 through November 2025. Those campaigns carried far more than 48 individual flight elements because several included orbiters, landers, rovers, penetrators, cameras, relay spacecraft, or aircraft.

Five outer-system or asteroid missions also visited Mars for gravity assists: Rosetta, Dawn, Europa Clipper, Hera, and Psyche.

The early record was dominated by launch and propulsion failures. Soviet spacecraft repeatedly failed to leave Earth, and NASA lost Mariner 3 before Mariner 4 returned close images.

Mariner 9 revealed the planet’s global geology. Mars 3 achieved a brief soft landing. Viking established sustained surface operations and attempted direct biology experiments.

Mars Pathfinder introduced practical rover operations and airbag landing. Mars Global Surveyor provided a global mapping foundation. Odyssey detected extensive shallow water ice and became a long-lived relay.

Spirit and Opportunity documented ancient water-related environments. Mars Reconnaissance Orbiter supplied high-resolution images and communications support. Phoenix sampled near-surface ice.

Curiosity established that Gale Crater once contained habitable environments. Mangalyaan demonstrated India’s interplanetary capability. MAVEN explained atmospheric loss. InSight measured the planet’s interior.

Hope expanded global atmospheric monitoring. Tianwen-1 achieved orbit, landing, and rover operations. Perseverance began caching scientifically selected samples, and Ingenuity proved that powered aircraft can operate on Mars.

ESCAPADE launched in November 2025 but remains near Earth as of July 17, 2026. Its planned Earth gravity assist in November 2026 would begin the main transfer toward a September 2027 Mars arrival.

Mars exploration has developed through repeated testing, inherited hardware, management reform, international cooperation, long-lived spacecraft, and increasing scientific precision. The next stage depends on deep drilling, new relay infrastructure, small coordinated orbiters, Phobos sample return, and attempts to bring Martian material to Earth.

Appendix: Top Questions Answered in This Article

How Many Dedicated Mars Launch Campaigns Had Occurred by July 17, 2026?

Humanity had conducted 48 dedicated Mars launch campaigns. The number counts each launch once, even when one rocket carried several spacecraft, such as an orbiter, lander, rover, helicopter, penetrator, or deployable camera. Counting every individual flight element would produce a larger total.

What Was the Earliest Attempt to Send a Spacecraft to Mars?

The Soviet Union launched Mars 1M No. 1 on October 10, 1960. Its rocket failed before reaching Earth orbit. Mars 1M No. 2 followed four days later and also failed during launch.

What Was the Earliest Successful Mars Flyby?

NASA’s Mariner 4 completed a successful flyby on July 15, 1965. It returned 21 complete images and part of another frame, measured the thin atmosphere, and found no global magnetic field comparable to Earth’s.

What Spacecraft Entered Mars Orbit Earliest?

Mariner 9 entered orbit on November 14, 1971. It arrived during a global dust storm and later mapped volcanoes, channels, canyons, polar deposits, and much of the planet’s surface.

What Was the Earliest Spacecraft to Reach the Martian Surface?

The Mars 2 descent module struck the surface on November 27, 1971, becoming the earliest human-made object to reach Mars. It crashed and returned no surface data. Mars 3 achieved a soft landing several days later but communicated for only about 20 seconds.

Which Mission Operated the Earliest Successful Mars Rover?

Mars Pathfinder deployed the Sojourner rover after landing on July 4, 1997. Sojourner examined rocks and soil, tested autonomous navigation, and demonstrated that a mobile vehicle could operate under delayed control from Earth.

Which Mars Mission Has Operated for the Longest Time?

Mars Odyssey holds the longevity record for continuous operation at another planet. It entered Mars orbit on October 24, 2001, and remained active as of July 17, 2026.

How Many Spacecraft Were Operational at Mars on July 17, 2026?

Eight spacecraft were treated as operational at Mars: Odyssey, Mars Express, Mars Reconnaissance Orbiter, Curiosity, the Trace Gas Orbiter, Hope, the Tianwen-1 orbiter, and Perseverance. ESCAPADE was active near Earth but had not reached Mars.

Did the Viking Missions Find Life on Mars?

The Viking biology experiments produced chemical responses that remain debated, but they did not establish the presence of life. NASA and most of the scientific community concluded that the results were inconclusive and could be explained through nonbiological soil chemistry.

When Could Samples Collected by Perseverance Reach Earth?

No confirmed return date existed as of July 17, 2026. NASA and the European Space Agency were still evaluating Mars Sample Return architectures. China planned to launch Tianwen-3 around 2028 and targeted a sample return around 2030, but that schedule remained subject to mission development and launch readiness.

Appendix: Glossary of Key Terms

Aerobraking

A method of changing a spacecraft’s orbit by repeatedly passing through the upper atmosphere. Atmospheric drag slows the spacecraft and reduces the amount of propellant needed to reach the desired orbit.

Atmospheric Escape

The process through which gases leave a planet’s atmosphere and travel into space. MAVEN and other orbiters studied how solar radiation, charged particles, and solar storms contributed to the loss of Mars’s atmosphere.

Biosignature

A substance, structure, pattern, or combination of evidence that may have been produced by life. A possible biosignature must be tested against geological, chemical, and contamination-related explanations before it can support a biological interpretation.

CubeSat

A small spacecraft built from standardized units. Mars Cube One demonstrated that CubeSat-class spacecraft could navigate through interplanetary space and relay communications during a Mars landing.

Deep Space Network

NASA’s global system of large radio antennas used to communicate with distant spacecraft. Complexes in California, Spain, and Australia provide tracking, commands, navigation data, and reception of scientific information.

Descent Module

The portion of a spacecraft designed to separate from a carrier or orbiter and travel through an atmosphere toward the surface. A descent module may contain a lander, rover, penetrator, or scientific package.

Earth Gravity Assist

A maneuver in which a spacecraft passes near Earth and exchanges momentum with the planet. ESCAPADE plans to use an Earth gravity assist in November 2026 to begin its main transfer to Mars.

Entry, Descent, and Landing

The sequence that begins when a spacecraft encounters the Martian atmosphere and ends at the surface. It may involve a heat shield, parachute, radar, cameras, rockets, airbags, landing legs, or a sky crane.

Flyby

A mission or encounter in which a spacecraft passes a target without entering orbit or landing. Flybys can return images and measurements, test instruments, or use the target’s gravity to change the spacecraft’s path.

Gravity Assist

A close planetary encounter used to alter a spacecraft’s speed or direction without consuming the equivalent amount of propellant. Rosetta, Dawn, Europa Clipper, Hera, and Psyche used Mars for this purpose.

Habitability

The capacity of an environment to support life. Evidence of liquid water, suitable chemistry, energy sources, and stable conditions can indicate habitability without proving that organisms existed.

Heliocentric Orbit

An orbit around the Sun. Spacecraft that miss Mars, complete a flyby, or finish a planetary encounter often continue in heliocentric orbit.

Inertial Measurement System

A set of sensors that measures rotation and acceleration. Navigation software uses these measurements to estimate spacecraft motion. Incorrect interpretation of inertial data contributed to Schiaparelli’s landing failure.

Ion Drive

A propulsion system that accelerates electrically charged particles to produce low but efficient thrust. Dawn used solar-electric ion propulsion during its journey through the asteroid belt.

Lander

A spacecraft designed to reach a surface and operate from a fixed location. Viking, Phoenix, and InSight were stationary landers, though some landers also carried rovers.

Mars Ascent Vehicle

A proposed small rocket designed to launch a sealed sample container from the Martian surface into orbit. No rocket had launched from Mars as of July 17, 2026.

Mars Relay Network

A group of orbiters that receive data from landers and rovers and retransmit it to Earth. Relay links allow surface missions to return more data than would normally be practical through direct communications.

Orbital Insertion

A propulsion maneuver that slows a spacecraft enough for a planet’s gravity to capture it into orbit. Failure to perform this maneuver caused Mars 4 and Nozomi to miss their planned orbital missions.

Orbiter

A spacecraft designed to circle a planet or moon. Orbiters can map large areas, monitor atmospheric and surface changes, relay communications, and observe landing sites over long periods.

Perchlorate

A chlorine-containing salt detected in Martian soil. Perchlorates affect water behavior, organic chemistry, life-detection experiments, human health planning, and possible resource use.

Planetary Protection

Policies and engineering practices intended to reduce harmful biological contamination of other worlds and protect Earth when extraterrestrial samples are returned.

Powered Descent

A landing phase in which rocket engines reduce speed and control the final approach. Viking, Phoenix, Curiosity, Perseverance, and other missions used forms of powered descent.

PrOP-M

A tiny Soviet rover carried by the Mars 2 and Mars 3 landers. Neither vehicle completed an operational surface mission, but they represented an early attempt to deploy mobile spacecraft on Mars.

Sample Cache

A documented collection of sealed geological samples stored for possible retrieval. Perseverance retains sample tubes aboard the rover and placed a backup depot on the Martian surface.

Sky Crane

A powered descent method used by Curiosity and Perseverance. A rocket stage hovers above the surface and lowers the rover onto its wheels using cables.

Solar Conjunction

A period when Mars and Earth lie on opposite sides of the Sun. Solar interference degrades radio communications, so mission teams reduce commanding and allow spacecraft to operate more autonomously.

Sol

A Martian solar day. One sol lasts about 24 hours and 39 minutes, making it slightly longer than an Earth day.

Terrain-Relative Navigation

An autonomous landing method that compares images taken during descent with an onboard map. Perseverance used it to estimate location, identify hazards, and select a safer landing point.

Trace Gas

A gas present in very small concentrations. Methane is a closely studied Martian trace gas because it may be produced through geological processes, biological activity, or both.

Upper Stage

A rocket stage used after initial ascent to place a payload into orbit or send it toward another planet. Many early Mars missions failed because their upper stages did not ignite, operated incorrectly, or broke apart.