Explanation:

Mars - the red planet. Mars is often called the 'Red Planet' because it appears in the sky as an orange-red star. The colour caused the ancient Greeks and Romans to name it after their god of war. Today, thanks to visiting spacecraft, we know that the planet's appearance is due to rust in the Martian rocks. When this happened, the iron within the dust reacted with oxygen, producing a red rust color. So, Mars is red because it has a layer of rusty dust covering its entire surface! Mars has some of the largest dust storms in the galaxy, in which the red dust gets whipped into the light atmosphere surrounding the planet.