On Jan. 25, NASA's Mars rover Opportunity is celebrating an amazing 12 years on the Red Planet. Here are just a handful of its biggest discoveries to date.
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.
As NASA's Curiosity rover investigates Mars dunes up close, we're beginning to scratch the surface of a larger, sandy mystery.
In a decidedly wintry-looking scene, frost-filled fractures fills a crater near the north pole of Mars -- as observed by NASA's Mars Reconnaissance Orbiter.
Find out the results of this year's readers' choice poll for favorite space story of the year! Can you guess #1?
NASA is calling off plans to launch a spacecraft to Mars that would use a seismometer and other instruments to learn what is happening in the planet's interior.
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.
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