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Technically, no object orbits the other; instead, they orbit their mutual "barycenter", which is a balance between the masses of the two objects. For example, the Earth and the Moon both orbit their "barycenter", which is still within the volume of the Earth. (That's why the Earth is the planet and the Moon is the satellite, instead of us being co-planets.)

Because the Sun is SO massive and the planets so relatively puny, the barycenter of the Sun-Earth system is pretty much at the center of the Sun; the Sun itself wobbles an incredibly tiny amount.

But that star-planet wobble is sometimes enough for us to detect it; that's how the first dozen or so extra-solar planets were discovered, because of the gravitational wobble caused by the planet!

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14y ago

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