Mars is the fourth planet from the sun. It is called "Earth's next door neighbor". Mars was named for the ancient Roman god of war. It is a reddish-orange color. No human has ever set foot on Mars so far.
- How long is an average day on Mars?
- What is Mars' diameter?
- What is the average surface temperature?
- How many moons does Mars have?
- How far away is Mars from the sun?