[Gravityloss]

Gas molecules in a box - entropy seems quite straighforward there. An even distribution is the most likely state and has the highest entropy.

In space, at large scales, gravity starts dominating - so stars and planets are actually a higher likelihood state than an even distribtion.

Isn't this just about statistical independence? In a small amount of gas (almost by definition of what is a gas), the particles don't have much effect on each other. One can assume statistical independence.

While in space with gravity overwhelming other effects, the particles have very much effect on each other. Hence the statistics about their state are affected by these dependencies. So the previous intuition about entropy can't hold.