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Message: <blockquote data-quote="Desdichado" data-source="post: 2142395" data-attributes="member: 2205"><p>Pluto and Charon do the same, to an even greater extent than the Earth moon, since they are closer in size to each other.  There are even asteroids identified with "moons."  And actually, all bodies rotate around a common center of gravity, it's just that with the greater mass of most planets relative to their moons, the center of gravity is deep within the planet itself.  This off-center (relative to the main body) center of gravity phenomena is what has allowed us to to detect the rash of extrasolar planets that have been discovered in recent years; because the center of gravity of the star and its satellites (planets) is not the same as the actual center of the star, it causes it to "wobble."</p></blockquote><p></p>