Van Allen Probes
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The Van Allen Probes, also known as the Radiation Belt Storm Probes (RBSP), were two NASA robotic spacecraft designed to study the Earth's Van Allen radiation belts. Launched in 2012, they were placed in a highly elliptical orbit and operated for seven years until they were both decommissioned in 2019. They were expected to be naturally deorbited by 2034
The orbits of the two Van Allen Probes, 2012-Present
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