What Is a Black Hole?

If you have two stars, and one of them is big enough to collapse a mention into a black hole, then you get a star orbiting a black hole. And that's actually the first way that we discovered black holes - saw this star orbiting something, nothing, nothing that we could see. So it's pretty cool. Even have a, like, planets orbiting this binary star black whole system. Like, you could maybe be on a planet and look up at the sky, and there'd be a sun and a black circle, right? And a black hole. N Then you're in the night sky, like, you could have an anti sunset where the black hole, you know,