Dark matter is a form of matter that does not interact with light but is fundamental to galaxy formation because it collapses more readily than ordinary matter.

“it's dark matter that sort of drives um Galaxy formation and then ordinary matter kind of comes along with it um and there's also just more of it and because there's more of it it can start collapsing sooner”

Dark matter is a substance that does not interact with light and is currently invisible to us, although it is gravitationally detectable and dominates the mass of galaxies.

“dark matter, which is what we were originally talking about, doesn't interact with the light at all. There's no shadow cast. There's no darkness. It just passes right through.”

Simulations must incorporate dark matter because it provides the majority of the gravitational force within galaxies.

“Well, one sixth of the mass of the galaxy is in anything visible. Stars, planets, gas, comets, all of that. One sixth of the mass. >> So, 85% of the gravity >> is from dark matter. It's something you don't even know what it is.”

Dark matter is a very well-established theory in physics, supported by significant observational evidence, although it has not yet been directly detected in a laboratory setting.

“So dark matter is a very wellestablished theory in the sense that even though we don't have direct evidence, we have so many mountains of observational evidence that very few people doubt that there's something there.”

Dark matter is likely a particle that is predicted by supersymmetry.

“look I'm relatively conservative when it comes to these things so I think that it's likely to be a particle”

Dark matter is a type of particle that currently lacks direct identification.

“Well the paleo part means that they've been around for a billion years. And so these Let me back up. We're trying to figure out what dark matter is made of. Yes. And we think it's some kind of particle we haven't identified yet.”

Dark matter is a real phenomenon that suggests the existence of fundamental particles or stuff that has not yet been discovered by particle physicists.

“we don't think that's the end of the story for lots of reasons mostly to do with astronomy actually thanks to you know you and your colleagues discovering this inconvenient stuff out there in the universe called Dark Matter so that suggests there must be more stuff that we we haven't found yet”