When a planet orbits around a star, the star also moves in an “orbit.” Since it is much...

When a planet orbits around a star, the star also moves in an “orbit.” Since it is much more massive than the planet, the star’s orbital radius is much smaller than that of the planet Work out how the ratio depends on the ratio of the masses. Discuss how this effect could be used to detect the presence of planets in distant solar systems. For simplicity, assume circular orbits.