As an expert in astronomy, I can tell you that none of the planets in our solar system are inherently "green" in the way that the term might imply a uniform and natural coloration. However, the planet that is often associated with the color green due to its appearance in certain conditions is Mars. This is because of the iron oxide, or rust, on its surface, which can give it a reddish hue, but in some images and under specific lighting conditions, it might appear more greenish. It's important to note that this color is not a true representation of the planet's color but rather an effect of the way light interacts with the surface materials and the distance from which we observe it.

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In some photos released after the Voyager 2 flyby (in 1986), Uranus looked green, but that color was artificial. Neptune: pale blue. As in the case of Uranus, the color is due to methane.read more >>