Like Earth, Mars spins at a tilt of about 25 degrees ... contains a higher concentration of dust than the south polar cap, making the ice less robust. "They're not symmetric seasons," Hansen ...
During Martian winter, a layer of carbon-dioxide ice settles out on top of the polar caps of water ice. While it is just a thin layer on the north polar cap, the south polar cap has much more ...
researchers used data from the Marsis radar to report signs of a 20km-wide subsurface lake located 1.5km under Mars' south polar layered deposits, a thick polar cap formed by layers of ice and dust.
Researchers have found evidence of an existing body of liquid water on Mars. What they believe to be a lake sits under the planet's south polar ice cap, and is about 20km (12 miles) across.