Virgin Galactic says the SS Unity shuttle achieved a speed equal to three times the speed of sound and an altitude of just over 55 miles above sea level before making its gliding return.
from https://www.reviewjournal.com/news/nation-and-world/virgin-galactic-rocket-ship-reaches-edge-of-atmosphere-2361027/
from
https://calliduselctric.tumblr.com/post/651933058765832192
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