NASA's Van Allen Probe A to Re-enter Atmosphere: Low Risk of Debris Impact

A 600kg NASA satellite is expected to plummet to Earth on Tuesday evening, sparking a warning from space experts about potential debris. However, officials stress that the risk of it hitting anyone remains slim.

Military forecasts from Monday suggest most of the the Van Allen Probe A, which has studied radiation belts for over a decade, will incinerate upon re-entry, though some fragments are likely to survive the heat.

US Space Force tracking data shows the probe should pierce the atmosphere at approximately 7.45 pm EDT. Space Force experts estimate the odds of injury at roughly 1 in 4,200.

Global Risk Levels and Historical Precedent

Space officials say they will keep tracking the descent to refine their timing, though the first estimates could be off by a day in either direction.

While a falling satellite may sound rare, figures from Wired show that thousands of tons of space junk have entered the atmosphere over a four-decade span.

Notably, the likelihood of an impact on land is slim because the ocean covers most of our planet. A 2011 report from space.com suggests the collective risk to the global population is roughly 1 in 3,200. Still, NASA scientist Mark Matney told the site that the danger to any single human is practically non-existent, at about one in several trillion.

The Sole Survivor of a Space Debris Strike

Lottie Williams, from Tulsa, Oklahoma, had a different experience in January 1997 while out in a park. After seeing a bright burst in the sky, she was hit on her shoulder by a 6-inch piece of metal that dropped from above.

Although the charred piece of metal was not officially classed as debris, NASA noted that the incident matched the trajectory of a Delta rocket stage breaking up in the atmosphere. Despite the impact, Williams walked away without any injuries, and she is still the only individual on record to have been hit by man-made junk falling from orbit.

Recent Meteorite Hits and Orbital History

A piece of space rock smashed into a German home this past Sunday, marking a rare land strike for the thousands of meteorites that fall annually. While experts believe that up to 17,000 such objects reach our planet each year, most simply vanish into the sea.

Military updates regarding the satellite's planned fall this Tuesday have shared more about its history than an exact landing spot. The craft, known as Van Allen Probe A, originally took off from Cape Canaveral on 30 August 2012 alongside its twin, Van Allen Probe B, to study the radiation belts held in place by our planet's magnetic field.

A Record-Breaking Legacy in Space

Both spacecraft were switched off in 2019 after their fuel ran dry, leaving them unable to keep their sensors pointed at the sun. While experts originally thought they wouldn't return to Earth until 2034, those initial estimates were wrong, though the second probe should remain in orbit until at least the end of the 2020s.

Reflecting on the retirement of Van Allen Probe A in 2019, Nelofar Mosavi, the project manager at Johns Hopkins Applied Physics Lab, noted that the craft 'broke all the records for a spacecraft to tolerate and operate in that hazardous region, all with no interruptions.' She explained that the entire 'mission was about resiliency against the harshest space environment.'