Friday, September 15, 2017: Earth received the last radio signals from NASA’s Cassini spacecraft, at 7:55 a.m. EDT. Launched in 1997, Cassini traveled 7 years to reach Saturn. There, it spent 13 years gathering data about the planet and its moons, until the craft’s fuel was almost exhausted. Its mission ended when operators purposely had it dive into Saturn’s atmosphere to disintegrate. .