A South Polar Pit or an Impact Crater on Mars?

©UA/NASA

Mars South Pole Terrain

We see many shallow pits in the bright residual cap of carbon dioxide ice (also called "Swiss cheese terrain").

There is also a deeper, circular formation that penetrates through the ice and dust. This might be an impact crater or it could be a collapse pit.

It is late summer in the Southern hemisphere, so the Sun is low in the sky and subtle topography is accentuated in orbital images.

Larger image

Please follow SpaceRef on Twitter and Like us on Facebook.