Johann Galle discovered Neptune in 1846, but John Couch Adams first introduced the idea of another planet beyond Uranus. Uranus wasn’t keeping its normal orbit, so it must have been being pulled off course by some foreign, unknown, alien object’s gravity. This freak object ended up being Neptune. Neptune is four times larger than Earth, and looks blue-green because of the methane in the atmosphere, just like Uranus. Also, like Jupiter, there’s a GREAT BLUE SPOT (well, it’s not named yet, but bear with me) that is also thought to be a storm cloud. Neptune is the last known planet in our solar system with rings. Neptune has 8 moons as we know so far. Uranus and Neptune are sometimes called ‘twins’ (like Earth and Venus) because of the similarity. There isn’t much known about Neptune either.