When the Mars 2020 rover lands on the Red Planet in early 2021, it will carry with it a small helicopter, the first human craft to fly on another planet. Until now, Mars has hosted orbiters, landers, and rovers, but no flying machines. The Mars helicopter is meant only as a technology demonstration. If it doesn’t work, the Mars 2020 mission will still succeed. If it does, it will have opened up entirely new avenues for exploring other worlds.
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