From virtually the beginning of the twentieth century, those
interested in the human exploration of space have viewed as central
to that endeavor the building of an Earth-orbital space station
that would serve as the jumping-off point to the Moon and the
planets, Always, space exploration supporters believed, a
permanently occupied space station was necessary outpost in the new
frontier of space. The more technically minded recognized that once
humans had achieved Earth orbit about 250 miles above the
surface-the presumed location of any space station- the vast
majority of the atmosphere and the gravity well would have been
conquered, and then human being were about halfway to anywhere they
might want to go.
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