posted on Apr, 27 2005 @ 04:59 PM
Yes, Mars has an atmosphere ... but not much of one. The air pressure on Mars is less than 1% of the air pressure on Earth at sea level. It is
composed mainly of Carbon Dioxide (95.3%) plus nitrogen (2.7%), argon (1.6%) and traces of oxygen (0.15%) While very thin, the atmosphere is thick
enough to support very strong winds due to temperature changes and does indeed create Dust Devils quite frequently. Photos taken from the orbiting
satellite show tracks in the soil from numerous Dust Devils and they have also been photographed from the Rovers on Mars.
Simply having an atmosphere is not in and of itself a positive sign of life. Recent readings of the Methane content in the Martian atmosphere, that is
localized in certain regions, give rise to the theory that it is being produced by bacteria in the Martian Soil. On Earth Methane is commonly produced
this way and there is little evidence that the Methane on Mars is coming from Volcanic or geological sources. Further study is being done to better
understand the Methane generation on Mars.