[SunkenCiv]

Thanks BenLurkin, extra to APoD. Chose this clip because I figure that someone will bring up a myth otherwise:

Since Charon is 1/12th the mass of Pluto the center of mass between the two actually lies a bit outside Pluto’s radius, making their little gravitational “dance” readily apparent. (The same effect happens with the Earth and Moon too, but since the barycenter lies 1,700 km below Earth’s surface it’s not nearly as obvious.)

[cripplecreek]

You can get real technical and explain where the barycenter of our solar system is as the planets orbit in different places at different speeds.

We’ll wait. :-I