Learn why scientists are cautiously optimistic about the potential biosignatures found in the Sapphire Canyon rock sample.

Let's talk about those concept images from 1995. At that time, scientists were already imagining humanity's future exploration of Mars, depicting Mars rovers collecting samples on the Martian surface ...

You knew the first clip was coming at some point this weekend, with Comic-Con happening and all, and now it's here in all of its emotional conflicting glory. Rob Thomas unveiled the first real footage ...

The mission is a man.