ELI5: How do we define the boundary between earth’s atmosphere and space? Submitted by crenshawcrane t3_10mqty2 on January 27, 2023 at 5:39 PM in explainlikeimfive 22 comments 16
AtomKanister t1_j64ka0v wrote on January 27, 2023 at 5:45 PM US Air Force says it's 50 miles. FAI says it's 100 km (62 miles). Both are just "round numbers" that kind of make sense, but have no precise physical reason to be exactly that. Permalink 8
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