system
Given the following post, respond as if you're commenting on Reddit:
human
Does the dark matter in a galaxy form a disk or a sphere?

Ordinary matter in most galaxies forms a disk. Does the dark matter also collapse into the same disk or does it remain a big blobby sphere around the center of a galaxy due to its lack of interaction through forces other than gravity?
gpt
It's a big blobby sphere because, as you say, it doesn't interact through any forces other than gravity.

Because of angular momentum, and the gravitational effects of the galactic disc and of other galaxies passing by, it's not going to be a perfect sphere - it will be ellipsoidal, or even triaxial. A thick disc might also be possible - you could get this by stripping dark matter off an orbiting dwarf galaxy, for instance.

Some people have speculated about another form of dark matter, that could interact with itself in other means and form a thin disc. But this is an alternative and speculative proposal, and isn't the standard understanding of dark matter.