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What is the fastest spacecraft ever built?

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Parker Solar Probe Becomes Fastest - Ever Spacecraft. At about 10:54 p.m. EDT, Parker Solar Probe surpassed 153,454 miles per hour — as calculated by the mission team — making it the fastest - ever human-made object relative to the Sun. This breaks the record set by the German-American Helios 2 mission in April 1976.
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How NASA Built the Fastest Spacecraft Ever



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