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what do they mean by air-breathing exactly? does that mean it wouldnt be able to be on spaceships in space because theres no air?
But that is just my point, even in the thin air at the edge of space wouldn't it get very hot on the outside metal travelling at 10 times the speed of sound?
Yes, that is just what he saidSo that is their main problem?
But that is just my point, even in the thin air at the edge of space wouldn't it get very hot on the outside metal travelling at 10 times the speed of sound?
Yeah but they make them out of special materials. Look at the SR-71 it travelled so hot that it was known to glow sometimes, did it just melt and fall apart? No...