Outer space, also called just space, refers to the relatively empty regions of the Universe outside the atmospheres of celestial bodies. Outer space is used to distinguish it from airspace (and terrestrial locations). Although outer space is certainly spacious, it is far from empty.
There is a wealth of science fiction predicated on faster-than-light interstellar travel. But it's a good bet that the speed of light is a permanent limit that will never be exceeded, as expressed by Einstein's Special Theory of Relativity (1905), which has been amply confirmed by experiments and is one of the foundations of physics.
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