Mars has a very thin atmosphere, which is at a scale height of eleven
kilometers. Its consists of 95% carbon dioxide, 3% nitrogen, and 1.6% argon. Since the atmosphere is so dusty, Mars's sky
has a tawny color that can be seen from its surface.
Another interesting thing about Mars's atmosphere is that it contains
methane. This unstable gas was first discovered by Michael J. Mumma. Mars produces about 150 ton/year of methane.