Europa

Answering viewer's Twitter questions backstage on space exploration, Europa, and aliens on Star Trek.

Interview on Jack Mangan's Deadpan about Pluto, life in the universe, Galileo, and religion.

Water-spewing geysers may mean there’s life on one of Saturn’s moons, and how proposed budget cuts could affect the search for life and other space science programs.

A conversation with Ed Weiler, director of NASA's origin program, Michael Lemonick, author of "Other Worlds" and Neil Tyson, the director of the Hayden Planetarium, about the possibility of life on other planets and NASA's program that explores the question.

Water in the Solar System: where it's abundant and where it's absent.