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Outer space definition: Outer space is the area outside the earth's atmosphere where the other planets and stars... | Meaning, pronunciation, translations and examples English Dictionary | Thesaurus | Translator | Grammar | Scrabble | Blog
Space begins at the end of the exosphere on Earth. The exosphere is the outermost layer of our atmosphere. Technically, by international convention, space is considered any point more than 100 km above the Earth's surface, for the awarding of astronaut wings to test pilots. But there are many varied considerations as to where the atmosphere actually ends and space begins.