Playback serverIf a title won’t play, switch servers.
How the Universe Works
Season 5 · Episode 7
Life and Death on the Red Planet
0.042mJanuary 24, 2017
Life once existed on Mars, but a series of devastating mass extinctions have made present-day life nearly impossible. The latest science shows how Martian life keeps bouncing back as it transforms from a watery world like Earth into a desert planet.