discovered planets by using the “wobble method”. i’m not sure that is the name of the method, but this is how it works. when planets, especially very large planets orbit a star, the star is slightly tugged in the direction of the planet. by measuring these wobbles over large periods of times scientist can determine the orbit and size of a planet. large planets pull the star further than smaller planets. using this technique scientist have found some 500+ planets in the last 10 or so years. 