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Maybe because once you start going faster than that there isn't much point staying inside the atmosphere? If you want to count spacecraft that record has been shattered.

It is like the land speed record. As soon as you get over a couple hundred miles per hour you might as well fly.

So when you get to mach 6 you might as well be in space....

And when you get to about mach 33 you might as well leave orbit.

There’s a huge new interest in hypersonic gliders.

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