Neptune's record winds are a real puzzle, because the planet receives very little solar energy at its vast distance from the Sun. That energy must come from inside: Neptune radiates 2.6 times more heat than it absorbs from sunlight.

Neptune's moon Triton orbits in the wrong direction (retrograde), strongly suggesting it is a captured Kuiper Belt object. Triton even has geysers that shoot nitrogen gas about 8 kilometers up into its thin atmosphere.