I was assuming a lower orbit - LEO is "up to 1200 miles". Aside from the
lunar trips, nobody has actully gone that high so far. Hubble is about
540km/340 miles up. The International Space Station is 340km/210 miles
up, though it needs periodic boosts to prevent orbital decay from
atmospheric friction.

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I read somewhere that the ISS had to be that low in order to accommodate the Russians.

Seems NASA had previously preferred to 'fly' above 300mi.

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