What are the colors of the planets in the Solar System? Are you curious? The materials of which the planet is composed , the type of surface and above all the type of atmosphere determine the colours of the planets. The type of elements that make up their atmosphere and the percentage they are present, the type of cloud formation or cataclysmic events, and the density of the atmosphere itself contribute to determining the colour perceived by the telescopes. Mercury: Mercury has a grayish-brown c