This is the case for the Sun-Earth system, the Sun-Jupiter system, and, by a smaller margin, the Earth-Moon system.

Any object gravitationally held by the rotating Earth-Moon system will be attracted to the barycenter to an equal and opposite degree as its tendency to fly off into space.

We're going in toward the sun, not out Anyway, the Earth-Moon system went past while you were talking, and here it comes again.

Under this definition, the Earth-Moon system is not a double planet.

If the Earth-Moon system happened to orbit farther away from the Sun than it does now, then Earth would win the tug of war.

They opened up the Earth-Moon system for development.

Space travel, thus far, has been limited to our own Earth-Moon system.

"The whole thing is like the Earth-Moon system scaled down by a factor of 5 or 10," Dr. Brown said.

As the Moon is slowly receding from the Earth, the Earth-Moon system may eventually become a double planet system on the basis of this barycentric definition.

(The Earth-Moon system is the largest exception, and this approximation is within 20% for most of Saturn's satellites.)