NASA Director of Planetary Science Jim Green (R) speaks at an end of mission preview news briefing for the Cassini mission to Saturn, September 13, 2017 at NASA's Jet Propulsion Laboratory in Pasadena, California. In the background is a 1/2 scale model of Cassini. Team members (R-L) are NASA Director of Planetary Science Jim Green, Cassini Project Manager Earl Maize, Cassini Project Scientist Linda Spilker and Hunter Waite, team lead for Cassini Ion and Neutral Mass Spectrometer. / AFP PHOTO / Robyn BeckROBYN BECK/AFP/Getty Images

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