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Before I get into this one here, dark matter is very elusive stuff in the universe. And it's the, the thinking is it's the, sort of the missing undetected matter that's holding everything together. The amount of matter, if you add up all the matter in the universe, as you see it now, all the very on it matter, all the normal matter we see around us that makes things up, makes everything up that we're, we're, we're, uh, uh, used to seeing around us. There's not enough of it to, uh, uh, produce gravitational effects and keep galaxies together, keep stars and planets in their orbits, things like this. There's just not enough of it. So there has to be something out there contributing to keeping everything all glued together. And, um, dark matter is the explanation for this. And its effects can be seen indirectly. No one can detect it yet. It doesn't, uh, interact with regular matter. So there's no experiment you can actually do right now to find it. A lot of it's just, uh, indirect observations. But, uh, it's pretty certain that it's there.