Controversial subjects with the facts you be tense, but we are a sub-science here to make things make sense.

Today we are talking to Katie Mack, the famous cosmologist and author of the new book The End of Everything,

Astrophysically Speaking. So truly today we're going to be talking about The End of the Universe,

also the beginning of the universe, the Big Bang, and it is, I think one of the most interesting

conversations maybe I've ever had in my life with one of the smartest people that we've ever

fricking Matt. But first, what did we learn this week? Oh, what did we learn this week?

All right, Greg, what did you learn this week? So I stayed in the world of astronomy

because today we are talking about cosmology and we're really zooming out.

Okay. I was reading Katie Mack's book, which I just want to say is absolutely incredible. I say

that a billion times during the interview, not a billion, that's hyperbolic of course, but I just

want to say it again. So I learned a lot from that book, but what I'm going to be talking about today

was just that I was reading about some new numbers and estimates that people have come up with

based on the size of our galaxy and the shape of our galaxy and the mass of our galaxy,

that they think there's probably between 100 billion stars to 200 to 400 billion stars. So there's

like an estimate. But they think there's that many stars, which I just think we're wild.

We're zooming out today and it's just like, we have the sun, we have the earth, we have the moon,

we have Elon Musk talking about, you know, starting on the moon. We think that zooming out,

but then it's like, okay, there's at least 100 billion stars in our galaxy and for comparison,

100 billion is approximately the number of people who have ever lived on earth. So the amount of

people who have ever really existed in this universe is the amount that the smallest of humans,

yeah, is the smallest amount of stars there are in our galaxy. So just like, that's a little,

you know, and just our galaxy, just our galaxy, an entrance into the type of sort of like large

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