For what purpose?https://twitter.com/whyteyj/status/931637463738667008 …
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The fastest manned spacecraft was Apollo 10 which went a little over 32x the speed of sound
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There’s no “speed of sound” in a vacuum becuase speed of sound is dependent on temperature and pressure of the medium sound travels through - so one can’t assign a Mach number to a spacecraft like Apollo 10 outside the atmosphere
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