There are few more potent reminders that Mars used to be a wet world than seeing ancient, dried up river beds etched into the red planet's surface.
More than a decade ago, NASA’s Mars Global Surveyor returned stunning images of gullies shaped like water-carved streams on Earth, raising the prospect that Mars may be a friendly haven for life. But appearances can be deceiving.
NASA's Mars rover is investigating some huge 'active' sand dunes on Mount Sharp -- and it looks like it's having some fun.
The first component of the European ExoMars mission is about to take its last long journey before launching to the Red Planet. Follow along with its construction in pictures!
The search for Mars' 'missing' atmospheric carbon has been called off as the planet may not have had a thick ancient atmosphere after all.
Chemical analysis by NASA’s Mars rover Curiosity indicates that water made several repeat appearances to create the rich mineral veins at a site called “Garden City” in the lower part of Mount Sharp.
A solar storm that missed Earth but smashed into Mars last March dramatically confirmed long-held suspicions that the sun is blasting away the Martian atmosphere, and doing so at a rate that will leave the planet airless in another couple of billion years, if not sooner.
As if Mars' thin, frigid, dry air wasn't harsh enough, now scientists have found new evidence of acid fog altering the rocks near the Spirit Rover.
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