system
Given the following post, respond as if you're commenting on Reddit:
human
How is Titan able to have an atmosphere pressure similar to Earth when it's gravity is so much lower than Earth's?
gpt
Cold makes sticky. 
Titan can hang on to so much atmosphere even though it’s gravity is much weaker, because the cold temperature means the collisions of gas particles are less energetic. Thus less likely to bounce hard enough that Titans gravity can’t recollect them.