Wherever life is found on Earth, even
in extreme environments, liquid water is present. The
current environment on Mars might be described as a
frozen desert, but it is possible that its extreme environment
could be capable of supporting life.
The search for life on Mars has been
focused on finding places that show evidence of flowing
water. As water flows over Earth's surface, it carves
distinctive features, such as valleys, channels, and
canyons. Layers of sediments indicate deposition in
water. In searching for likely places to find life on
Mars, researchers look for areas with these types of
either image to see a larger version. Carefully examine
the features formed by flowing water on each planet.