The two Van Allen Probes were sent into space in 2012. Getty Images
NASA's Van Allen Probe spacecraft, which has been in space for nearly 14 years, is set to re-enter Earth's atmosphere. Weighing over 1,300 pounds (600 kg), the spacecraft is expected to re-enter around 7:45 PM EST (00:45 GMT) on Tuesday. Although the exact time is uncertain, NASA has indicated a 24-hour margin of error in predicting its re-entry.
The Van Allen Probe's Long Journey
Launched in 2012, the Van Allen Probe A was part of a mission to gather groundbreaking data about Earth’s radiation belts. These belts, known as the Van Allen belts, are areas of charged particles trapped by Earth's magnetic field. The probe’s twin, Van Allen Probe B, continues to operate and is not expected to re-enter the atmosphere until at least 2030.
The spacecraft spent several years flying through these radiation belts, gathering valuable information about how these particles interact. It was initially planned to last two years, but the mission lasted nearly seven years before the probes ran out of fuel and could no longer be oriented toward the Sun.
A Controlled Re-entry Expected
NASA expects that the spacecraft will burn up as it re-enters the atmosphere. However, some parts of the probe may survive the intense heat and pressure. Despite this, NASA and the US Space Force assure that the risk of harm from debris is extremely low. According to the space agency, the chances of anyone being harmed by a piece of the spacecraft are one in 4,200, which they have classified as a "low" risk.
The exact location where the probe will re-enter the atmosphere remains unclear, but NASA and the US Space Force will continue to monitor the re-entry and provide updates on its path.
Mission Achievements and Discoveries
The mission was a major success, offering insights into the Van Allen belts. These radiation belts play a crucial role in protecting Earth from cosmic radiation, solar storms, and the solar wind, which can be harmful to both humans and technology. One of the significant discoveries made by the mission was the identification of a transient third radiation belt. This belt forms during intense solar activity, adding a new layer of understanding to our knowledge of Earth’s space environment.
Over the course of its mission, the Van Allen Probes provided unprecedented data on how these belts function, including how they gain and lose particles. These findings are vital for understanding space weather and its potential impacts on satellites, communication systems, and even astronauts.
The End of an Era
While the Van Allen Probe A mission is coming to a close, the data it gathered continues to shape our understanding of the Earth's protective radiation belts. The spacecraft’s long duration in space, far beyond its original mission length, stands as a testament to its success. The mission ended after the probes could no longer be positioned to face the Sun, which is essential for their operation.
