Mars' underground flood channels are much deeper than we thought

Mars is home to some of the most chaotic terrain in our solar system, and questions behind how its assorted canyons, fissures and chasmscame to be are among the most pressing in all of planetary science. Now, newly published research reveals that Marte Vallis — one of Mars' largest geological features — is longer, and… »3/07/13 2:00pm3/07/13 2:00pm