NASA ‘s Hubble Space Telescope and MAVEN mission are working to solve this mystery. Mars’s water can freeze into the ground or break into atoms, which then escape into space. We need to understand how these atoms leave the planet to determine how much water Mars had and what happened to it.

Mars is home to strange spider-shaped geologic formations known as the araneiform terrain, which are found mostly in the southern hemisphere.

A team of scientists at NASA have confirmed how Mars' 'spider' formations are carved by carbon dioxide. They were first discovered in 2003 and each formation can stretch more than half-a-mile from end-to-end.

To uncover the hidden features, researchers employed a sophisticated technique. New research presented at the Europlanet Science Congress this week has uncovered astonishing findings beneath the dusty surface of Mars.