Earth & Space
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Planets, weather, oceans and the sky above them.
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Why astronauts float: the space station never stops falling
Astronauts on the International Space Station look weightless, but at 400 km up, Earth's gravity is still about 90% as strong as on the ground. The trick is…
Why we only ever see one side of the Moon
The Moon always shows us the same face, so it's easy to assume it doesn't spin. It does. It turns exactly once for every orbit, about every 27.3 days, so the…