A SpaceX Crew Dragon capsule carrying the four astronauts plummeted through our planet's atmosphere at speeds reaching 17,500 miles per hour, eventually drifting down on parachutes to rest in calm waters off the coast of Daytona, Florida.
Air speeds of this magnitude create massive amounts of friction, which turns into heat, testing the limits of the capsule's heat shields with temperatures estimated at 3,500 degrees Fahrenheit, according to SpaceX.
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