The Moon. Mass . = 7.4 x 10 25 g = 0.012 M Earth = 1738 km = 0.27 R Earth. Radius. Density. = 3.3 g/cm 3 (Earth 5.5 g/cm 3 ) = 1/6 that of Earth. Gravity. We always see the same face of the Moon. This means: period of orbit = period of spin Why?. Tidal Locking.

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