In an appearance at NASA's JPL, the actor explains why his latest intergalactic role was so 'liberating,' while the movie's directors and author Andy Weir take us behind the scenes.

Could ancient humans really have built the pyramids without extraterrestrial help? Or do such questions reveal more about modern anxieties than the past itself?

A civilization capable of interstellar travel may also be one that has moved beyond conquest, excess and ecological ...