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Astronomy Cast

Ep. 777: The Eddington Limit

Astronomy Cast

Astronomy Cast

Science, Natural Sciences, Astronomy

4.83.4K Ratings

🗓️ 5 January 2026

⏱️ 36 minutes

🧾️ Download transcript

Summary

Astronomy Cast Ep. 777: The Eddington Limit By Fraser Cain & Dr. Pamela Gay Streamed live on Dec 29, 2025. How big can a star get? This is a calculation made by one of the original pioneers of modern astronomy, Sir Arthur Eddington. And it's named after him, the Eddington Limit. Now, astronomers are finding examples of giant black holes early in the Universe, calling into question some of Eddington's assumptions. Let's explore this fascinating concept! Why are stars sphere-ish? Why do blackholes not eat everything? Why do pulsating stars pulsate? It all comes down to work done by Eddington at the beginning of the last century, and today we're going to look back at Eddington's work and all its applications in modern Astronomy. This show is supported through people like you on Patreon.com/AstronomyCast In this episode, we'd like to thank: Andrew Poelstra, BogieNet, Brian Cagle, Burry Gowen, David, David Rossetter, Ed, Gerhard Schwarzer, Jason Kwong, Jeanette Wink, Michael Purcell, Sergey Manouilov, Siggi Kemmler, Sérgio Sancevero

Transcript

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0:00.0

I'm

0:02.0

Oh

0:03.0

Oh Thank you. I'm Astronomycast, Episode 777, The Eddington Limit.

0:53.0

Welcome to Astronomycast from weekly facts-based journey through

0:55.3

the cosmos where we help you understand not only what we know, but how we know what we know. I'm

0:59.5

Fraser Kane. I'm the publisher of the University. With me, as always, is Dr. Pamela Gay,

1:03.2

a senior scientist for the Planetary Science Institute and the director of Cosmast.

1:07.9

Hey, Pamela, how are you doing? I am doing well. The howling wind is tremendous. If you hear, if you hear what sounds like ghosts in the background, that is the wind, people. Right. That is the wind. Now, as usual, I can't hear it because we use Zoom to record and the modern technology has made it. So when your dogs are barking, I don't hear it. And so I'm definitely not going to hear the wind.

1:29.4

But yeah, here we are.

1:44.9

Now, I'm going to do something kind of mean, but it's for the best. And that is I'm going to say nice things about you and you're just going to have to take it. which is, you know, I think a lot of people, when they reach out to us about astronomy cast,

1:44.6

and they talk about like our scripts and sort of how we prepare, they don't realize

1:50.0

that there is no script, that this is entirely off of the top of our heads that I go in.

1:57.6

And what's nice is for me, I don't really even have to prepare at all. I write the intro,

2:02.4

which is sort of like my token donation to the cause. And I usually come up with the idea,

2:11.0

but often Pamela has ideas that she wants to express. But then she has to prepare. And she doesn't have to prepare just for whatever is going to be

2:19.7

the script. She literally has to prepare for anything that I might ask. And I don't know what I'm

2:25.9

going to ask. So how can she know what I'm going to ask? And so, Pamela, you are amazing

2:32.0

for being able to gather and prepare so much information. Be ready, sort of on your toes, nimble on your toes to handle whatever comes your way.

2:42.4

And in this case, there's going to be a lot of information about the Eddington limit.

2:48.4

And I don't know what I'm going to talk about.

2:49.8

You don't know what I'm going to talk about. It's true. You know what you're going to talk about. You don't know what I'm going to talk about.

2:51.0

You know what you're going to talk about.

...

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