you are viewing a single comment's thread.

view the rest of the comments →

[–]roc 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (1 child)

Because molecules in a gas all move with some speed. This speed can be high enough to a body's gravity. Rocks on the other hand do not move around but lie in one place.

[–]wizzwizz4[S] 0 insightful - 1 fun0 insightful - 0 fun1 insightful - 1 fun -  (0 children)

Great explanation! You're missing the word "escape", though.