NASA's Radiation Belt Storm Probes A and B are secured to work stands in the Astrotech payload processing facility.

NASA's Radiation Belt Storm Probes A and B are secured to work stands in the Astrotech payload processing facility, where technicians work to clean and inspect the two spacecraft.

The Radiation Belt Storm Probes, or RBSP, mission will help us understand the sun’s influence on Earth and near-Earth space by studying the Earth’s radiation belts on various scales of space and time. RBSP will begin its mission of exploration of Earth's Van Allen radiation belts and the extremes of space weather after its launch aboard a United Launch Alliance Atlas V rocket. For more information, visit http://www.nasa.gov/rbsp. Photo credit: NASA/Kim Shiflett