# Black Holes and their varying sizes.

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As I understand it black holes are infinitely dense. Yet some are larger because they’ve consumed more material than others.

So I’m confused because if they are infinitely dense shouldn’t they all be the same size? Or is infinity + a few hundred solar systems larger than just infinity? Maybe I just don’t understand infinity that well…

In: Planetary Science

The point of infinite density is the center. The further out is drawn to that point. Imagine a thimble being infinitely deep, and a pool being infinitely deep. The closer you get to the center, the deeper it goes to the point of never ending

Black holes most likely are not infinitely dense. There’s a point at the middle where the math breaks down and the density trends toward infinity but we don’t think that’s what *actually* happens in there. We just don’t have any way to observe it and don’t know what math to use to describe it. If a black hole really did achieve infinite density it would suck in the entire Universe, and we’re pretty sure that’s not happening.

A black hole’s size is based on the event horizon – something which depends exclusively on the mass in the hole. A larger one has more stuff in it and so more gravity.

The size of the matter inside of the hole is often quoted as infinitely small but the question “how big is the matter inside of the black hole” itself makes no sense.