VIDEO: Four billion years ago, Mars looked a lot like Earth does today. So it's not surprising that a team of scientists believe that they may have discovered the first signs of ancient alien life on the planet.
"Life on Mars", from the BBC. "Sam Tyler: I think we need to explore whether this attempted murder was a hate crime. Gene Hunt: What, as opposed to one of those I-really-really-like-you sort of murders?
Book review of If You Were Me and Lived on... Mars
This mosaic of images from the Mast Camera (Mastcam) on NASAs Mars rover Curiosity shows Mount Sharp in a white-balanced color adjustment that makes the sky look overly blue but shows the terrain as if under Earth-like lighting.