NASA hopes to bring the first soil and rocks back from Mars. The process is set to begin in 2020, when the agency's next rover is slated to cache samples for return by two future missions, as-yet unplanned.
Credit: NASA
NASA's Curiosity rover is in the prime of its life, exploring the rocks, soil and air of Mars. But the agency is already planning its successor—and this time, the scientific stakes are higher.
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