The next step in fully understanding hot Jupiters is to use these discoveries to establish the relative likelihoods of the three possible migration mechanisms in order to determine which systems formed which way. Jupiter-sized planets are the rulers of their planetary system because of their dominant gravitational influence and the way their migration pathway sculpts the architectures of their system. Understanding these worlds is the first step to constructing a unified theory of planet formation that scientists have been seeking for centuries.
-JULIETTE BECKER is an assistant professor of astronomy at the University of Wisconsin–Madison. She is also a founding member of the new Wisconsin Center for Origins Research (WiCOR).