How the Space Shuttle Killed an American Halley’s Comet Mission

NASA missed the chance to visit Halley’s Comet in 1986 when the famed sentinel swung close to Earth, as it does every 76 years. Luckily for history, the Europeans flew Giotto past it on this day (March 13) in 1976, and some other nations sent their own probes. The full story of NASA’s withdrawal is [...]