A NASA satellite, Van Allen Probe A, is expected to reenter Earth’s atmosphere on or around March 10, 2026, carrying with it a slightly elevated risk of harm to people on the ground – a risk that exceeds the agency’s own established safety standards. While the probability of injury remains low, estimated at approximately 1 in 4,200, the event highlights the challenges of managing orbital debris and the increasing complexities of space weather’s impact on satellite lifespans.
The Van Allen Probes, launched in 2012, were instrumental in advancing our understanding of Earth’s radiation belts, regions of energetic charged particles trapped by the planet’s magnetic field. These belts, named after physicist James Van Allen, pose a hazard to spacecraft and astronauts, and understanding their dynamics is crucial for protecting space-based assets. The mission concluded in 2019 when both probes ran out of fuel, but unexpected solar activity has accelerated the reentry of Probe A.
Originally designed for a two-year mission, the probes operated for nearly seven years, gathering unprecedented data. According to NASA, the mission resulted in “the first data showing the existence of a transient third radiation belt, which can form during times of intense solar activity.” The unexpected acceleration of the reentry is due to increased atmospheric drag caused by higher-than-anticipated solar activity, which causes the Earth’s atmosphere to swell outward. NASA predicts the 1,323-pound spacecraft will re-enter the atmosphere at approximately 7:45 p.m. EDT on March 10, 2026, with an uncertainty of +/- 24 hours. NASA Communications
This isn’t the first time a NASA satellite has returned to Earth outside of current risk guidelines. The Rossi X-ray Timing Explorer (RXTE) reentered the atmosphere in 2018 with a 1-in-1,000 chance of causing harm, according to NASA. RXTE was launched in 1995, shortly before NASA formalized its standards for orbital debris mitigation and reentry risk management. Scientific American
Orbital Debris and Reentry Risks
While no one has ever been injured by falling space debris, components have survived reentry and caused property damage. The Van Allen Probes’ orbits, inclined at 10 degrees to the equator, limit the potential impact zone to a relatively narrow swath of the tropics. NASA expects most of the spacecraft to burn up during reentry, but some components are anticipated to survive. The agency, working with the U.S. Space Force, is continuing to monitor the probe’s descent and refine reentry predictions. The Hill
The situation with Van Allen Probe A underscores a growing concern about space debris and the challenges of responsible space operations. China has too faced scrutiny for its handling of reentry risks, launching four heavy-lift Long March 5B rockets between 2020 and 2022 and allowing their massive core stages to fall back to Earth uncontrolled. Two of these core stages dropped wreckage in the Ivory Coast and Borneo, though no injuries were reported.
What’s Next for Van Allen Probe B?
Van Allen Probe B is also nearing the end of its orbital life. NASA currently estimates its reentry will occur no earlier than 2030, and will carry a similar level of risk to the public as Probe A. NASA Communications The agency continues to refine its models for predicting atmospheric drag and satellite decay, aiming to improve the accuracy of reentry forecasts and minimize potential risks.
The ongoing monitoring of both probes and the lessons learned from these reentries will inform future satellite design and mission planning, contributing to a more sustainable and safe space environment. As space activity increases, managing orbital debris and mitigating reentry risks will become increasingly critical for ensuring the long-term viability of space exploration and utilization.
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