Neptune’s upper atmosphere contains some of the fastest winds in the solar system, reaching speeds upwards of 400 m/s (900 mph). How these blustering winds are sustained is a mystery to planetary scientists – Neptune is 30 times farther away from the Sun than Earth is, meaning the planet receives 900 times less flux than the Earth. Thus, it appears that incoming radiation alone can not power the extreme winds on Neptune. Voyager 2 found that Neptune emits over twice...