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Last updated on April 16, 2014 at 7:25 EDT

Radiation Belt Storm Probe Mission Trailer

January 8, 2011

With launch scheduled for 2012, the Radiation Belt Storm Probe (RBSP) are two identical spacecraft that will investigate the doughnut shaped Van Allen radiation belts, the first discovery of the space age. Even though we have know about their existence for half a century, they are still a mystery today. credit: NASA