Mars

Mars is the fourth planet from the Sun and is a dusty, cold, desert world with a very thin atmosphere. It's about half the size of Earth.

Mars has a thin atmosphere made up mostly of carbon dioxide, nitrogen, and argon gases. To our eyes, the sky would be hazy and red because of suspended dust instead of the familiar blue tint we see on Earth.

Mars' sparse atmosphere doesn't offer much protection from impacts by such objects as meteorites, asteroids, and comets.

It takes sunlight 13 minutes to travel from the Sun to Mars.