Neptune is definitely the odd one out of the gas giants. It's tilted at a strange angle, and its moons are completely different from any other gas giant we know of. A new paper by researchers at Caltech posits that might be because Triton, by far Neptune's largest moon, absolutely obliterated the regular moon system it previously had, except for one particular exception – Nereid. Let's start with a little background on Neptune's moon system. Triton is weird. It rotates the opposite direction to