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NASA astronauts aim for Florida coast to end SpaceX flight

CAPE CANAVERAL, Fla. The first astronauts launched by Elon Musk’s SpaceX company departed the International Space Station on Saturday night for the final and most important part of their test flight: returning to Earth with a rare splashdown. NASA’s Doug Hurley and Bob Behnken bid farewell to the three men left behind as their SpaceX Dragon…
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What, really, is the speed of sound?

We know that the speed of light seems to be the upper limit for how fast something can travel in the universe. But there’s a much lower speed limit that we’ve only recently (in the grand scheme of things) managed to overcome here on Earth:…