Why do female astronauts take birth control pills when they go into space? What exactly happens in a spaceship?
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2023-11-03 07:16:56
Can we reach the edge of the universe with a spaceship flying one light year per second? How long will it take to arrive?
We used to think that the world was small and the Earth was the center of the universe. But now we know,The Earth is very small in the universe, it is just a planet revolving around the sun...
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2023-10-05 21:53:44