#403 – Lisa Randall: Dark Matter, Theoretical Physics, and Extinction Events

1414.112 - 1434.419 Lisa Randall

Well, that's a possibility. We actually don't know what dark matter is in the first place. We don't know what most of it is. We don't know what a fraction is. I mean, it's hard to measure. Why is it hard to measure? For exactly the reason you said earlier, we don't see it. So we want to think of possibilities for what it can be. especially if those give rise to some observational consequences.