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The speed of a body moving through a fluid can be classified into categories depending on the speed relative
to the speed sound in the fluid. When a body is moving at a Mach number of between 5 and 12 it is moving
between 5 and 12 times the speed of sound. This flow is called hypersonic. Bodies re-entering from the
Earth's atmosphere from space (such as the Space Shuttle) will eventually slow to hypersonic speeds, before
slowing even further and landing in the case of the shuttle (or making a crater in case of a meteor).
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