It is extremely cold on Neptune: the ground temperature is around-220'C. The reason for this is that it is far away from the sun, almost double the distance that its neighbour Uranus. As a result, it hardly gets any heat from the sun. Because of its blue colour, the eighth planet of the solar system was named after the Roman god of sea, Neptune. The blue colour does not indicates liquid water, but instead its atmosphere is made of hydrogen and helium.
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