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What would happen to earth when a planet passes by, almost hitting earth?

hypothetically speaking, if there was a planet, twice the size of earth, that would pass by earth, almost hitting us, would there be any dramatic change to the earths magnetic field? would there be any change with gravity? would Einstein's theory about polar change in the future be plausible?

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Rod Martin Jr (lone77star) says

4 years ago
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Melvin Porter (melpor) says

4 years ago
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    joniah2884 4 years ago

    that's when there is a collision, right? how about if the planet is passing by, barely hitting earth?