Nasa Worm Red — 6 museum-grade prints in this palette. Compton GRO was the second of NASA's four Great Observatories — after Hubble and before Chandra, Spitzer, and the multi-wavelength program that transformed 1990s astrophysics. BATSE's burst catalog established that gamma-ray bursts were cosmological, not local solar-system phenomena, setting the stage for Swift and Fermi decades later. The Hubble Space Telescope deployed 25 April 1990 and initially returned blurred images due to a primary mirror polishing error discovered weeks after launch. Servicing Mission 1 in December 1993 installed corrective optics that unlocked the observatory's full potential, producing Deep Field images that revised estimates of galaxy counts and universe age. STS-1 launched on 12 April 1981 — twenty years to the day after Yuri Gagarin's first human spaceflight — and proved that a winged spacecraft could return astronauts to a runway rather than an ocean splashdown or desert parachute landing. The shuttle program became NASA's primary human spaceflight vehicle for three decades, building the International Space Station and launching Hubble, Chandra, and dozens of other payloads.