system
Given the following post, respond as if you're commenting on Reddit:
human
Why is the dark matter halo spherical?

Dilettante scientist here, so be gentle.
As I understand it, galaxies are disc shaped due to the conservation of angular momentum, but the all the data I’ve seen about dark matter says that it is a roughly spherical distribution around the galaxy. Are there any theories as to why this is? Or is this evidence that dark matter doesn’t even interact with itself?
gpt
A cloud of matter that *does* collide with itself eventually settles to a disc with the same (net) angular momentum, be it planetary rings, stellar formation discs, or galaxies. That's just a simple result of probability of collisions. In the *absence* of such collisions, a spherical distribution would be the default assumption.