Relatively empty regions (with very small densities) of the universe outside the atmospheres of celestial bodies.
OmegaWiki
Any region of space beyond limits determined with reference to boundaries of a celestial system or body, especially the region of space immediately beyond Earth's atmosphere.
Wiktionary
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The first major milestone in space exploration was in 1957, when the USSR's Sputnik 1 orbited the Earth
WordNet 3.0 & Open English WordNet
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