Coming up on Star Talk, Cosmic Queries, we have a visit from our old friend, theoretical physicist, Brian Green.

And in it, we respond to questions about the plank length, about measuring the size and position of particles inside of atoms.

We talk about string theory, of course. We talk about D equals MC squared. How does it work? Where does it apply? That and more on Star Talk. Check it out.

Welcome to Star Talk, your place in the universe where science and pop culture collide.

Star Talk begins right now.

This is Star Talk. Neil deGrasse Tyson here, your personal astrophysicist. I got Chuck Nice with me Chuck.

Hey Neil. Yeah, we got a Cosmic Queries, one that's backed by popular demand.

One of the most popular. Oh yes, we had my friend and colleague Brian Green, theoretical physicist, professor of physics, and math at Columbia University, author of the very best selling elegant universe, followed by the fabric of the cosmos, followed by the hidden reality.

My boys into all kinds of freaky cosmic stuff, and we got them back for more by popular demand. Brian Green, welcome back to Star Talk.

Thank you, but to see you guys. Yeah. Yeah, for those who are watching this on video, I think that's a black hole behind your head. It is full wall size.

They all just like that. Did you just emerge from that black hole for this?

I've done that. I would have broken the laws of physics. You know that. Oh, we can't have that. Yes.

But all of your knowledge would still be intact. Or is that that that's information? That's a very good point.

Yeah, subtle point. I don't know how many of your audience just got the subtlety of Chuck's comment, which is quite.

My boy Chuck, I gave him a little diploma recently. I know for how much he's learned of physics. I created just a little sort of start talking in diploma.

Well, because yeah. Oh, yeah. I love it. Let me tell you something. It's the reason I do this job. The damsel ain't for the money.

Speaking of money, I just want to. So Brian, what you are, you have two professorships was one not enough professor of physics and professor of math.

Yeah, each department doesn't know about the other, which is.

My book is drawn to paychecks. That's so funny. Okay, start talk fans. Don't tell anybody. Exactly. We meet every day that a very small cafe.

Me in the math department. It reminds me of our colleague, Sean Carroll, who moved from Caltech to the Johns Hopkins University.

He has a dual appointment there in physics and in philosophy. Yeah. Yes. Yeah. So they're feeding his interest by those two affiliations.

So I guess that's what's happening with you, right? To some extent, yes. You know, I started out as a math kid and then became a physics nerd.

...