A bombardment of asteroids on a once-icy ancient Mars may have created vast oceans of liquid water, which persisted for 200 million years.
On Mars, formerly water-filled craters transformed to dry mile-high mounds with the help of wind.
Get the full Mark Watney experience and immerse yourself in a 'virtual reality' Mars landscape courtesy of NASA's Mars rover Curiosity.
Sure, NASA's Mars rover Curiosity has seen sand before, but this dune is by far the biggest and the six-wheeled rover is making the most of it.
As NASA's Curiosity rover investigates Mars dunes up close, we're beginning to scratch the surface of a larger, sandy mystery.
Find out the results of this year's readers' choice poll for favorite space story of the year! Can you guess #1?
The search for Mars' 'missing' atmospheric carbon has been called off as the planet may not have had a thick ancient atmosphere after all.
NASA's Curiosity rover will soon get history's first up-close look at Martian sand dunes.
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