'Where No Spacecraft Has Gone Before' Cassini-Science Team's Farewell to Saturn --"We've Got to Go Back -- We Know It" (WATCH Today's 'Galaxy' Stream)

"We left the world informed, but still wondering, and I couldn't ask for more," said Cassini project manager Earl Maize at a press conference on September 13, just before mission end. "We've got to go back -- we know it."...