Where Did The Atmosphere On Mars Go? | Out Of This World Weekly
It is thought that Mars doesn’t have enough gravity to hold a large atmosphere, allowing small portions of atmosphere to slowly escape over time. The solar wind may have contributed to this atmospheric erosion because Mars doesn’t have a large magnetic field to protected the atmosphere. It isn’t known if a large impact by an asteroid or comet could have knocked off a large portion of the atmosphere but this is yet another theory as to the disappearance of the atmosphere. Whatever the cause, knowing that Mars once did have a thicker atmosphere does give us hope of again terraforming the atmosphere of Mars to a comfortable level. Knowing exactly what is causing the atmosphere to escape would help us to preserve that atmosphere in the future.