Marcia Dunn, Associated Press Marcia Dunn, Associated Press CAPE CANAVERAL, Fla. (AP) — One of NASA's premier space telescopes plunged to Earth on Wednesday, ending its 22-year investigation of the universe's biggest explosions. Subscribe to our Science Newsletter to explore the wide worlds of science, health and technology. The Swift Observatory's demise came less than three months after a long-shot rescue mission failed.