Why Mars' atmosphere is so thin?

Answer 1

It may have gradually lost its atmosphere to the solar winds or a body or bodies that collided with mars

Answer 2

There are two factors. First, Mars has weaker gravity and so is less able to hold onto an atmosphere. Second and more importantly, Mars lacks a magnetic field to shield it from the solar wind, which allowed much of its atmosphere to be stripped away.

Answer 3

Mars has a thin atmosphere because it lost its magnetosphere about 4 billion years ago. This allows the solar wind to strip air atoms away from it. See the Related Link below for more information.

Answer 4

Mars has a thin atmosphere now because there is less heat and light energy reaching it now for reasons unknown to man as of now. The less energy gases have the less chance of being in a gaseous state. As gases lose energy they start to precipitate or condense into a liquid and then into a solid. Most of Mar's atmosphere has condensed into those ice caps you see on the planet and lots of it is also underground.

Answer 5

Mars has fairly weak gravity and does not have a magnetic field to protect its atmosphere from the solar wind.

Answer 6

Because Mars has many surface features that are characteristics of erosion and deposition by water

Answer 7

Scientists believe, but aren't in 100% agreement, that since Mars lacks a protective magnetic field, that the solar wind has stripped-away much of the atmosphere.

Answer 8

it heats up the surface temperature..:)