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I've actually heard someone argue that because of this the moon is actually not a moon but our sister planet.
by pluma 11y ago
I've actually heard someone argue that because of this the moon is actually not a moon but our sister planet.
- rimunroe 11y agoAll orbits go around a common center of mass which is not the center of mass of the orbiting bodies separately. The Earth-Moon center of mass is still located within the Earth. [edit] I forgot to mention that the distinction between a satellite/moon and another co-orbiting body had to do with the location of that barycenter being within one of their bodies, if I recall correctly.