NASA Experiment Suggests the Need to Dig Deep for Evidence of Life on Mars

Curiosity taking a selfie.

NASA's Curiosity Mars rover took this selfie at a location nicknamed 'Mary Anning' after a 19th century English paleontologist. Curiosity snagged three samples of drilled rock at this site on its way out of the Glen Torridon region, which scientists believe was a site where ancient conditions would have been favorable to supporting life, if it ever was present. (Image: via NASA / JPL-Caltech / MSSS)