The American ISEE-3 mission, which had been parked at a Lagrangian point at the end of its mission, was revived by the legendary Robert Farquhar, sent crashing toward the Moon five times to gain momentum, and then set off toward a comet, 21P/Gioacobini-Zinner, even passing inside its tail, examining its chemical composition. This was the first manned mission to a comet (just before the Soviet, European, and Japanese missions, which would reach Halley’s Comet six months later).
