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TrashPosterInTheDark
replied 2363d
Because of its mass.
2 / 4
replied 2358d
How do you know it's mass unless you measure it as two attracting spheres?
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TrashPosterInTheDark
replied 2358d
No. Because we know its size and composition.
replied 2355d
How do you figure we know those?
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3,000
replied 2358d
Then gravity on earth is due to earth’s mass? & how do we know the mass of the moon?


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