Saturn's fourth-largest moon, Dione, passing behind the ringed planet's largest moon, Titan, in a view from NASA's Cassini spacecraft. Photo: NASA/JPL-Caltech/Space Science Institute

NASA just picked 2 finalists for its next billion-dollar space mission — here’s what the projects could accomplish

NASA says it will select a winner in 2019 and that the mission would be launch-ready by 2025

Topic |   Space

TOP PICKS

Saturn's fourth-largest moon, Dione, passing behind the ringed planet's largest moon, Titan, in a view from NASA's Cassini spacecraft. Photo: NASA/JPL-Caltech/Space Science Institute
READ FULL ARTICLE