Cool view of Mars
If you check out the red planet's south pole, you might see these patterns.
Many Martian landscapes contain features that are familiar to ones we find on Earth, such as river valleys, cliffs, glaciers and volcanos.
But Mars has an exotic side too, with landscapes that are alien to Earthlings. This image shows one of these exotic locales at the south pole. The polar cap is made from carbon dioxide (dry ice), which does not occur naturally on the Earth. The circular pits are holes in this dry ice layer that expand by a few metres each Martian year.
New dry ice is constantly being added to this landscape by freezing directly out of the carbon dioxide atmosphere or falling as snow. Freezing out the atmosphere like this limits how cold the surface can get to the frost point at -130 ºC. Nowhere on Mars can ever get any colder this, making this this coolest landscape on Earth and Mars combined.