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Daniel and Kelly’s Extraordinary Universe

What's the densest thing in the Universe that's not a black hole?

Daniel and Kelly’s Extraordinary Universe

iHeartPodcasts

Science, Astronomy, Natural Sciences, Physics

4.62.5K Ratings

🗓️ 25 December 2025

⏱️ 47 minutes

🧾️ Download transcript

Summary

Daniel and Kelly dive into the hearts of blue giants, massive planets, and neutron stars to reveal a surprising limit on cosmic density.

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Transcript

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0:00.0

This is an I-Heart podcast.

0:02.5

Guaranteed human.

0:12.2

Gravity is a monster.

0:14.7

Not the kind of monster that jumps out and slashes you.

0:17.9

It's the kind that shuffles slowly, never racing, but always getting closer.

0:23.3

It's patient, happy to wait billions of years until everyone else has had their turn, but it never,

0:29.8

ever, ever gives up. It's always there, ready to tear you to shreds or crush you into a speck.

0:36.9

And in the end, it's gravity that

0:38.8

dominates our cosmic destiny. We rely on quantum forces, like the structural integrity of the

0:44.4

earth or the radiation pressure from fusion that keeps the sun from collapsing. They keep gravity

0:49.7

at bay for now. But inevitably, they will fail us, and gravity will overcome each of our defenses,

0:57.1

making white dwarves and neutron stars and eventually victorious in creating black holes,

1:02.9

gravity's ultimate trophies. But where exactly is the quantum limit? How close can one get to

1:09.6

the black hole threshold without collapsing?

1:11.9

What is the last line of quantum defense against the plotting, unavoidable onslaught of the gravitational

1:18.4

monster? We'll dig into all of that on today's episode. Welcome to Daniel and Kelly's

1:24.7

extraordinarily crushing universe.

1:47.2

Hello, I'm Kelly Wienersmith. I study parasites and space, and today we're going to learn that physicists love noodles.

2:01.6

I got nothing.

2:06.1

Hi, I'm Daniel.

2:10.5

I'm a particle physicist, and I do worship at the arm of his noodily appendage.

2:12.5

Oh, man, that is a throwback.

...

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