STS-67 was a Space Shuttle Endeavour astronomy mission carrying the ASTRO-2 observatory. Launched from Launch Complex 39A on March 2, 1995, the crew used ultraviolet telescopes on a Spacelab pallet for around-the-clock observations of planets, stars, galaxies, and intergalactic helium, then landed at Edwards Air Force Base on March 18 after what was then the longest Shuttle flight.