Artificial radiation belts could expose satellites to damaging particles long after a nuclear explosion in space, according to a November 6, 2026, research preprint. The study connects radiation-driven spacecraft failures with subsequent collisions and orbital decay, examining how the affected environment would evolve after the initial event.
Zachary Petersen, Hong Qin, Sarah Thiele, and Sébastien Philippe present the assessment in Effects of a Nuclear Detonation. Their simulations describe a sequence in which radiation disables spacecraft, disabled spacecraft lose maneuverability, and collision hazards develop alongside the continuing radiation exposure. Replacement satellites entering affected orbits can encounter both hazards.
Radiation That Remains After the Explosion
Earth’s magnetic field can retain energetic charged particles around the planet. These trapped populations form radiation belts, through which spacecraft can pass repeatedly as they orbit.
NASA’s account of human-generated space weather describes how Cold War nuclear tests produced artificial belts resembling the naturally occurring Van Allen belts. Significant populations of artificially trapped particles persisted for weeks and, in one case, years. Satellite electronics were exposed during subsequent passages through these regions, and some spacecraft failed.
This persistence separates the immediate event from its longer-lived consequences. A spacecraft can accumulate radiation exposure across repeated passages through an affected region. The artificial particles also have energy characteristics that allow researchers to distinguish them from naturally occurring radiation-belt populations.
Natural space weather provides related physical context. The Sun supplies energetic particles and electromagnetic energy that interact with Earth’s magnetic environment. Nuclear testing added particles through a different source, producing disturbances that researchers could observe and compare with natural processes.
Starfish Prime Provides a Historical Record
The United States conducted Starfish Prime on July 9, 1962. The test created an artificial radiation belt that affected spacecraft operating afterward, providing a historical example of damage continuing beyond the explosion itself.
In a NASA technical account, E. G. Stassinopoulos describes the additional ionizing radiation received by spacecraft and the resulting satellite losses over subsequent months. The account identifies solar-cell damage as a major contributor. It also describes the exposure of Telstar, which launched the day after the test.
That timing connects the historical event directly to the question of replacement infrastructure. A satellite launched after an explosion can still enter an environment altered by it. Launching new hardware and restoring a usable orbital environment are separate physical processes.
Researchers subsequently used observations from several spacecraft to examine the artificial electron population and its decline. The NASA account describes analyses extending across years, including measurements collected from September 1963 through December 1968. New Space Economy’s Starfish Prime history provides additional background on the test and its consequences.
Disabled Spacecraft Change the Collision Environment
The new preprint extends the radiation assessment into the behavior of the orbital population. Spacecraft disabled by radiation can lose the ability to avoid other objects or perform controlled disposal. Collisions then add fragments to the environment through which surviving and replacement satellites travel.
Atmospheric drag acts at the same time, gradually lowering the orbits of affected objects. The authors model removal of many lower-altitude spacecraft alongside continuing radiation and debris exposure elsewhere. Their results describe conditional outcomes for the modeled population and assumptions, rather than observed contemporary losses.
The study’s connection between these processes gives service restoration a physical dimension beyond replacing failed equipment. In its simulations, the environment encountered by a newly inserted spacecraft reflects both the remaining radiation and the objects left by earlier failures.
