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The moon is tidally locked. (one side always faces toward earth and the other never does) This is proof that it was liquid at some point after it started orbiting earth. Tidal locking occurs because earth's gravity stretches the moon to a less that circular shape. When the moon was liquid it could deform as it rotated. This deformation took energy which was taken from the moon's rotational velocity, eventually the moon was robbed of any rotation relative to the earth. Mercury rotates very slowly relative to the sun (58.6 day rotation period, 87.9 earth days per year(one day/night period ends up taking two years)), this was probably due to partial tidal locking. The moon is tidally locked. (one side always faces toward earth and the other never does) This is proof that it was liquid at some point after it started orbiting earth. Tidal locking occurs because earth's gravity stretches the moon to a less that circular shape. When the moon was liquid it could deform as it rotated. This deformation took energy which was taken from the moon's rotational velocity, eventually the moon was robbed of any rotation relative to the earth. Mercury rotates very slowly relative to the sun (58.6 day rotation period, 87.9 earth days per year(one day/night period ends up taking two years)), this was probably due to partial tidal locking.

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