On Tuesday, March 13, 2018 at 2:08:46 PM UTC-5, casagi wrote:
I've seen them and don't recall any references to a mysterious unknown
force holding galactic things together. Maybe you could give us a
reference quote of sorts ?

As the episode on Dark Matter says, the whole reason scientists first thought of

Dark Matter is because there is no other way of explaining what holds a galaxy together.

You don't want quotes from the Internet. All kinds of crazy people live there.