For seventy years, every spacecraft NASA sent to another world either landed in one place and stayed there, or rolled slowly across the surface on wheels. Then in April 2021, a four-pound helicopter called Ingenuity lifted ten feet off the floor of Mars’s Jezero Crater, hovered for thirty seconds, and changed the rules. Five years on, the rotorcraft revolution is no longer a tech demo. NASA has begun full assembly of an eight-rotor, nuclear-powe…
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