Quote:
Originally Posted by N1
I understand the presence of an atmosphere depends on its composition of and its rate of replenishment. Any atmosphere is subject to erosion by cosmic radiation and while gravity obviously essential for one to exist, it won't ensure a sustainable atmosphere just by itself. Likewise, less gravity than Earth doesn't necessarily mean no atmosphere. Consider Titan.
|
Insufficient mass results in the loss of atmospheric gases and can only be offset by relatively constant replenishment.