The WASP-12 system. The massive gas giant WASP-12b is shown in purple with the transparent region representing its atmosphere. The gas giant planet's orbit is somewhat non-circular. This indicates that there is probably an unseen lower mass planet in the system, shown in brown, that is perturbing the larger planet's orbit. Mass from the gas giant's atmosphere is pulled off and forms a disk around the star, shown in red. (Courtesy: KIAA/Graphic: Neil Miller)