Hydroden and Helium.
The Neptunes was created in 1990.
neptunes gravity is high
The gravitational pull between them causes Pluto to come near neptune. Did you know that when Pluto goes to go around the sun, it goes through Neptunes system. (Neptune has rings)
hydrogen and helium
It was discovered in 1846.
gas
Hera & Zeus
triton
?
it is verydense but not really dense
THE NEPTUNES
yes it is