Mars is the fourth planet from the sun. It is about half the size of our planet, Earth. Mars is often called the "red planet" because it looks red. Although it is red, this planet is not hot. In fact, Mars is very cold. In winter on Mars, it can be much colder than even the coldest place on Earth.
What about life on Mars? Some people believe there might be something living on Mars. Books and movies also tell stories about aliens on Mars. Now, robots are on Mars looking for life. They go around, take pictures, and send these pictures back to Earth. No life has been discovered on Mars yet, but the robots keep looking.
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