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Name: T Wilson
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Question:
Does the Sun have any motion in respect to our solar system, or is it completely stationary (no spin, etc.) with all of the other planets orbiting around it?



Replies:
The Sun not only spins on its axis but also travels around the center of our galaxy in a big orbit. And our galaxy is moving relative to other galaxies. Basically, everything is moving.

Hawley


If we neglect the motion of our solar system as a whole, then all of the bodies in the solar system revolve around the center of mass of the solar system. The center of mass is an imaginary point that is determined by a sort of averaging over the whole. The solar system's center of mass lies deep within the Sun (because the Sun contains the vast majority of the solar system's mass) but not at its center. Hence, the Sun also revolves about this point; we say that it wobbles (in our case, almost entirely due to Jupiter's pull on the Sun). At the moment, looking for this sort of wobble in other stars is our best bet for inferring the existence of planetary systems around those stars.

RC Winther



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