Does Mars have an atmosphere?

Yes, Mars does have an atmosphere. The Martian atmosphere contains about 95.3% carbon dioxide (CO2) and 2.7% nitrogen, with the remainder a mixture of other gases. However, it is a very thin atmosphere, roughly 100 times less dense than Earth's atmosphere. If Mars did not have an atmosphere, images taken from the surface of Mars would show a black sky, even during the day.


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Learn about IRAS, the first infrared telescope launched into Earth's orbit!