NASA's Europa Clipper will take off on a long journey to Jupiter's moon Europa. The icy moon could potentially host alien life — and there's only one way to find out.

Discovering extraterrestrial life would be one of the most profound scientific and philosophical revelations that our species has ever made. But such a big discovery won't come easy. Our starting point is to first search other worlds for signs of habitability,

NASA’s Europa Clipper probe will spend about four years exploring whether Jupiter’s icy moon, Europa, could support life.