Farewell to a first responder: after 22 years and 2,000 cosmic explosions, Swift comes home

Some telescopes stare. Swift pounced. Launched in 2004 for a two-year mission, NASA's Neil Gehrels Swift Observatory spent 22 years as astronomy's first responder: spotting gamma-ray bursts — the most violent explosions in the universe — and swinging itself around within moments to watch them fade. It logged more than 2,000 bursts and 1,400 supernovae, helped trace a ghostly neutrino to its source and caught two neutron stars colliding in 2017. This week, its orbit finally decayed beyond saving — a bold commercial rescue attempt earlier this year came heartbreakingly close — and Swift will burn up over the ocean, its work complete and its archive permanent. Smithsonian Magazine tells the story of a two-year mission that simply refused to stop giving.