i read somewhere that if the solar system got filled with oxygen, the planets would first stop spinning cuz of friction (that and then everything would fall onto the sun or smthng) but oxygen already exists on earth, so how is the earth still spinning?
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Earth is spinning due to suns gravitational pull. Earths speed is indeed less compared to if there was no atmosphere. But its not same as filling solar system with air.
For example consider an athelete spinning in hammer throw vs same athlete trying to spin underwater.
The Centrifugal force decreases weight of hammer.
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