ASTRO-110 Lecture Notes - Lecture 22: Tidal Force, Double Planet, Continental Drift
18 Sep 2020
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We are next going to examine the surface of the moon and contrast it with the surface of the earth. I think you will be astonished at the amount of insight we will achieve about the structure and evolution of all of the terrestrial planets from this study. In this context we are going to ignore the fact that the moon is a satellite of the earth, and take seriously our earlier statement that earth-moon is a fine example of a double planet. Our moon is one of seven large satellites in the solar system. 3476 km (2160 mi) is slightly less than the distance from new york to san francisco. (nasa) There is nothing like it on earth! The few craters that can be found on the earth (and there are some) are all eroded and worn away by wind and water.
