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Any vehicle (such as a rocket) MUST exceed the 'speed-of-sound' in order to escape the atmosphere (actually much, much faster). The 'speed-of-sound' varies with the thickness of the medium in which it is travelling. At low altitudes (close to sea-level), sound can travel up to 880mph because the air has high density. At high altitude, where the air is 'thinner', sound travels only around 650mph. The escape velocity needed to completely escape the earth's gavitational "well" is around 25,000mph. However, if you only want to reach "space" (orbit the earth), the speed necessary is closer to 6,500mph (7 to 10 times the 'speed-of-sound'). Since we have to go faster than sound just to reach "space", obviously we can (and do) go faster while IN space. The Earth is travelling at about 35,000mph through "space", which means we are all travelling over 40 times faster than sound right now.

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Does sound travel faster through space or room temperature?

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