Mars is called the Red Planet., , Mars is very similar to Earth., , So we call it our ‘sister planet’., , Mars is half the size of Earth., , Like Earth, Mars rotates on its axis., , A day on Mars is 24 hours and 39 minutes long., , Mars, like Earth, revolves around the Sun., , Mars’ orbit around the Sun takes almost two Earth years., , A year on Mars lasts 687 days., , Mars has two moons., , Two moons are small, and close to the planet., , One of the moons revolves round Mars three times every day., , Like Earth, Mars has mountains, valleys and volcanoes., , It takes 200 days to travel from Earth to Mars., , Before people can go to Mars, robots can study the planet and look for living things., .

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