The colours of the planets make our Solar System an array of red, blue, yellow, brown and grey. What colours are the planets and why?. Here's a tour of the planets that examines what we know about each world's true colors. What color is Mercury? Mercury has a gray, slightly brownish appearance, somewhat similar to Earth's Moon. Our best global pictures of the planet were made using images partially comprised of light from outside our visual range.
Venus is the second planet from the Sun, and the sixth largest planet. It's the hottest planet in our solar system.. Venus. Image credit: NASA/courtesy of nasaimages.org In Earth's sky, Venus is the third brightest object, after the Sun and Moon. Occasionally, it is even visible to the naked eye during daylight hours. So what colour is Venus in the sky? Perhaps, the one we can catch by looking at the planet through binoculars or a telescope. We will see a fairly bright disk with a whitish-yellow, marbled.