F4Z3_G04T t1_j316279 wrote
Reply to comment by Solonotix in Dream Chaser: Hypersonic space plane that will ferry passengers to and from Orbital Reef by [deleted]
But dream chaser never goes hypersonic (or only very shortly)
The speed of sound changes in the upper atmosphere. By the time dream chaser is that fast, there is no sound to measure the speed of
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