Question

Why the surface of Mars is red ?

Answer 1

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.

Answer 2

I’m pretty sure it’s because Mars is a rocky sandy planet, near the sun, and the high temperature makes the sandy surface look red. For earth examples that can be related, think the Australian deserts.