Today marks Curiosity's 10th year of cruising around Mars. It's just one of the robot explorers that have told us most of what we know about Mars.
Opportunity found the first definitive evidence of ancient water on MarsOpportunity died in a dust storm, which cut off solar powerIn 1998 and 1999, NASA hurled a pair of spacecraft at Mars; one was supposed to orbit the planet and another was supposed to land near one of the poles. Both failed. Stung from the disappointment, NASA decided to build a rover plus a backup for its next attempt.
Both rovers lasted years beyond their expected three-month lifetimes. And both did far more Martian science than anticipated. The pale rock at center, seen beneath the Opportunity rover’s robotic arm in 2013, was one of many at the rover’s landing site that held long-awaited evidence that liquid water once flowed on Mars.“The images that the rover first sent back were just so different from any other images we’d seen of the Martian surface,” says Abigail Fraeman, a planetary scientist at JPL. “Instead of these really dusty volcanic plains, there was just this dark sand and this really bright bedrock.
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