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Neptune — Neptune (also known as Docay or Nebtuun) is the eighth planet from the Sun, measured from the centre of the solar system. It is the most distant known planet since Pluto was removed from the list of major planets in 2006. Neptune is one of the giant planets composed of gas and ice, with no solid surface on which to stand. Neptune has a blue colour that comes from the methane gas in its atmosphere, which absorbs red light and reflects blue light. Its core is roughly four times the mass of Earth, and by volume it is … (read more)