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by stratomorph
5653 days ago
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It's a bit misleading to flatly cite the 100km Karman line as if there was no room to debate "where does space begin?" The boundary could be lower: NASA gives out astronaut wings at 50 miles (264000 feet). Or maybe it should be higher: Orbits decay pretty quickly under atmospheric drag at that altitude, and drag is a factor even at ISS altitude, requiring a bit of fuel now and again to replace energy lost to drag. The point at which reasonable flying speed equals orbital speed (~100 km) is just one demarcation, chosen by convention from many possibilities. |
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