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There's no precise answer to the question of "Where does space start?"

But you might consider it to be the distance far enough off the surface of the earth where artificial satellites can survive in orbit ... meaning the altitude where the atmosphere has thinned out sufficiently so that atmospheric drag is essentially negligible. This places us in the neighborhood of the orbital altitude of the International Space Station, which is a significant milestone; so in order to be able to offer a figure for negotiation, let's say ...

Space begins at roughly 220 kilometers (140 miles) from the earth's surface.

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