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On August 6, 2012, Nasa's Curiosity rover touched down on Mars. It landed in the Gale Crater, an ancient lake which was formed by an asteroid strike billions of years ago. During its travels, the rover determined the lake environment on this part of Mars offered the conditions needed for life. View Toward 'Vera Rubin Ridge' on Mount Sharp, Mars Credit: NASA/JPL-CALTECH/MSSS Over the last five years, car-sized Curiosity has travelled over 10 miles and studied more than 600 vertical feet of martian rock. Mid-2017 Map of NASA's Curiosity Mars Rover Mission Credit: NASA/JPL-CALTECH/UNIV. OF ARIZONA It's also had time to take a few selfies. The Curiosity rover takes a selfie Credit: Nasa Jet Propulsion Laboratory While Curiosity has helped pave the way for potential human exploration on Mars, it's a lonely job. So, every year on August 6, Curiosity is programmed to sing a lonely birthday tune. Perhaps someday, someone on Mars will finally hear it.