Introduction

The universe appears to be filled with some kind of invisible matter that we call Dark Matter, but physicists don't actually know what this stuff is. We do know that whatever it is, it can't interact with light very much, otherwise we would have seen it by now. Could black holes possibly be the dark matter? In today's episode, we'll see that the answer to this question is actually maybe, but probably not the kinds of black holes you've ever heard of.