A massive space probe, the now-defunct Van Allen Probe A, is expected to reenter Earth’s atmosphere on Tuesday evening, earlier than anticipated. While most of the spacecraft will likely disintegrate during reentry, a few components may survive, reports BritPanorama.
NASA has indicated that the 1,323-pound (600-kilogram) vehicle will strike the atmosphere around 7:45 p.m. ET, with an uncertainty of +/- 24 hours. The odds that a piece of debris will cause harm to a person are approximately 1 in 4,200, as stated by the agency in a recent news release.
This probability is considered low by NASA, reflecting better odds than previous incidents involving space debris. “We’ve had things that have reentered have a 1 in 1,000 chance, and nothing happened; if we have a few that are 1 in 4,000 or 5000, it’s not a horrible day for mankind,” remarked Dr. Darren McKnight, a senior technical fellow at space-tracking company LeoLabs.
However, the risk posed by the current situation is higher compared to notable past events, such as the 2018 reentry of China’s space station, which had an estimated chance of debris hitting a human of less than one in a trillion, with no injuries reported.
End-of-life planning
The Van Allen Probe A was launched in 2012 to study the two cosmic bands of high-energy particles trapped in Earth’s magnetic field. NASA had originally intended for the spacecraft to burn up upon reentry as a method of safe disposal. However, initial predictions suggested the spacecraft would not reenter until 2034.
Recent analyses, prompted by an active solar cycle, determined that atmospheric drag increased significantly, hastening the probe’s reentry timeline. “In 2024, scientists confirmed the Sun had reached its solar maximum, triggering intense space weather events,” NASA noted in a statement, underlining that such conditions accelerated the spacecraft’s descent.
NASA’s policy mandates that US-launched vehicles must reenter or be safely disposed of within 25 years of mission completion. This is meant to prevent defunct satellites from contributing to the growing issue of space debris, a concern highlighted by space debris experts in recent years.
As the scope of space debris risks increases, calls for better mitigation strategies have grown. There remains a clear need for ongoing discussions about improving spacecraft design to ensure complete incineration during reentry, a practice increasingly adopted by modern satellite operators.
All of this reflects a pressing challenge for the space industry as the landscape of space travel continues to evolve.
