An old NASA science satellite is no more. The U.S. Space Force says the Van Allen Probe A plunged uncontrolled from orbit on Wednesday, reentering over the Pacific west of the Galapagos Islands. NASA expected some of the 1,323-pound spacecraft to survive entry, with most of it burning up in the atmosphere. Its twin, the Van Allen Probe B, is still orbiting Earth, but no longer functioning. Launched in 2012, the twin spacecraft flew through the Van Allen radiation belts that surround Earth, studying them for seven years before ceasing operation.