Cell division is the process by which a parent cell divides into two or more daughter cells. Cell division usually occurs as part of a larger cell cycle.
Neptune's atmosphere, like Jupiter's and Saturn's, is composed primarily of hydrogen and helium, along with traces of hydrocarbons and possibly nitrogen; it contains a higher proportion of ices such as water, ammonia, and methane.
Neptune, like the rest of the gas giant planets in the Solar System, can be broken up into various layers. The composition of Neptune changes depending on which of these layers youâre looking at. Letâs see what Neptune is made of. Composition of Neptune. Image credit: NASA. The outermost layer of Neptune is the atmosphere, forming about 5-10% of the planetâs mass, and extending up to 20% of the way down to its core.