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The force on parts of an extended body in a non-uniform gravitational field, due to residual gravitational attraction between the overall effect on the body and the expected effect on the point in question. Tidal forces are most notably in large moons orbiting near their primaries.

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... you aren't envisioning a giant tunnel in space that the moon would pass through, are you? Like the crude drawing below? We don't have the materials strong enough to attach it to earth with. We …
answered Apr 24 '15 by Ehryk