How do astronomers search for planets around other stars?
Planets are too dim and too close to their suns to be seen by today’s telescopes. However, each such sun also moves, around the joint center of gravity of it and of its planets. For instance, with just one planet, the Sun is always on the opposite side of the center of gravity. Therefore, if astronomers see a slight wobble in the position of a distant star, they may deduce from it the existence and motion of its planets.
