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Atmosphere of Mars

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Victoria Liss
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« on: November 08, 2010, 01:29:53 pm »

Structure
Mars' atmosphere is composed of the following major divisions:

Lower Atmosphere: This is a warm region affected by heat from airborne dust and from the ground.
Middle Atmosphere: Mars has a jetstream, which flows in this region.
Upper Atmosphere, or Thermosphere: This region has very high temperatures, caused by heating from the Sun. Atmospheric gases start to separate from each other at these altitudes, rather than forming the even mix found in the lower atmospheric layers.
Exosphere: Typically stated to start at 200 kilometers (120 mi) and higher, this region is where the last wisps of atmosphere merge into the vacuum of space. There is no distinct boundary where the atmosphere ends; it just tapers away.
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