Helicopters on Mars may sound like something from a science fiction novel — or perhaps just a typical "Doctor Who" episode. But actually, they're not fully confined to the world of sci-fi; after all, ...
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NASA Rover Finds Crushed Helicopter on Mars—A Sobering Discovery After 72 Historic Flights
In a Martian valley carved by ancient rivers, a four-pound helicopter sat in silence, its blades half-buried in red dust. Nearly three years after it made history by achieving powered flight on ...
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