Stolen from Space Photos, and taken by NASA.
This false-color subframe of an image from the High Resolution Imaging Science Experiment camera on NASA’s Mars Reconnaissance Orbiter shows the north polar layered deposits at top and darker materials at bottom, exposed in a scarp at the head of Chasma Boreale, a large canyon eroded into the layered deposits.
Now that’s a very cool idea; that, just like in sedentary rocks, the geological history of a planet can be recorded in its ice layers. I wonder what Mars has been through.
raincoaster 
Here is what Mars has been through:
http://www.cnn.com/2007/TECH/01/07/mars.life.ap/index.html?section=cnn_latest
No wonder aliens refuse to visit us.
I dunno about that guy; sounds pretty fringy to me, and it’s not as if NASA has a closed mind about what could or could not be life. They’ve been open to investigating all kinds of things. And the headline is sheer bad journalism: if they’d found Earth-type life they’d have killed it, too. Audubon worked from dead animals. All the explorers have killed their subjects before shipping them home for study, in part because they don’t know how to duplicate the life conditions for the duration of the journey.