Titan, Comet, Mars Among Targets of Decadal Survey Candidates

WASHINGTON — An underwater mission to the lakes of Titan, a touch-and-go visit to the surface of a comet and a three-pronged Mars sample-return expedition are among more than two dozen candidate missions a National Research Council (NRC) committee studied over the past year as it drafts NASA’s next 10-year plan for robotic exploration of the solar system.