Neil deGrasse Tyson

But...

You look at it as a physicist at a much more sort of refined level.

And I see things that gather according to forces.

So what's been going on to give us the universe?

Okay.

That's why you're my favorite guest.

Oh, Jen, I didn't properly introduce you.

You're a professor of astronomy and physics up at Barnard College.

That's why I said we go up the street because you're just…

you know two miles north of the american museum of natural history and uh you've been doing this since childhood and it's just been great to have your enthusiasm and plus you you you hosted a pbs special oh yeah but on black holes what was the title of that black hole apocalypse yeah see see what i'm saying yeah it's my you were the on-camera host of that nova one of my son's favorite

It is.

Yeah, yeah.

That's crazy.

Right, so people will think, oh, dark matter, why isn't that just black holes?

Right.

But so there's a difference between matter you can't see because it's not giving you light and matter that you can never see because it will never give you light.

How would you distinguish that?

That's deep.

I hadn't thought about that.

So you only know a tree's shadow is there because there's light.