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Apr 9, 2022, 8:00 am312 pts
Green Car CongressThe same propulsion technology that goes into rockets has made hypersonic speeds—Mach 5 and beyond, i.e., more than 5 times the speed of sound—possible since the 1950s. However, to make hypersonic flight more common and far less expensive than a rocket launch, engineers and scientists are working on…
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