Gullies carved into impact craters on Mars provide a window into climate change on the Red Planet. A new analysis suggests Mars has undergone several ice ages in the last several million years. The driver of these climate swings is likely the Red Planet's wobbly axis tilt. Read the study, in press in the journal Icarus, by lead author Jay Dickson.
Gully patterns document Martian climate cycles
January 30, 2015