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1. Mars is the fourth planet from the sun in our solar system.
It is a cold planet, with temperatures that vary significantly but are generally well below freezing.
It's called the "Red Planet" due to the rust-colored iron oxide dust on its surface.
The atmosphere is thin, primarily composed of carbon dioxide, with very little oxygen.
Its surface gravity is only about one-third of Earth's.
A Martian day, called a "sol," is 24 hours and 37 minutes, just a bit longer than an Earth day.