Almost four hundred years ago Galileo saw Neptune through his small telescope. He mistook it for a star. Neptune is the eighth planet in our solar system. It takes Neptune 165 years to orbit the sun. Triton, one of Neptune's moons, has on active volcano on it.
Triton orbits Neptune in the opposite direction of the other moons.
Neptune's atmosphere is made of hydrogen, helium, and methane. Neptune is made of rock, liquid, and gaseous hydrogen. The temperature on Neptune can be -360 degrees farenheit to 2,000 degrees farenheit. Neptune is 2,794 million miles away from the sun. Neptune's diameter is 30,199 miles.