Fast Facts About Mars
Mars is about half the size of Earth
Mars' gravity is about 40%, or 2/5th of Earth's
The Martian atmosphere is extremely thin: only about 1/100th of Earth's. It consists of about 95% carbon dioxide (Earth's atmosphere is less than 1/10th of 1 percent carbon dioxide)
There is enough dust in Mars' atmosphere that the sky is usually yellowish-brown
That dust is very, very fine: about the size of cigarette smoke
Mars has essentially the same axial tilt as Earth, leading to seasons

While Earth's orbit is basically round, Mars' orbit takes it significantly closer to the sun during one part of the year. That makes summer in the southern hemisphere warmer than summer in the northern hemisphere


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