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Ask a Spaceman!

AaS! 261: What are Black Dwarfs?

Ask a Spaceman!

Paul M. Sutter

Astronomy, Science, Natural Sciences

4.8853 Ratings

🗓️ 2 December 2025

⏱️ 37 minutes

🧾️ Download transcript

Summary

What happens to a white dwarf when it cools off? How long does it take? Do they just stay black forever, or will something more interesting happen to them someday? I discuss these questions and more in today's Ask a Spaceman!

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Hosted by Paul M. Sutter.

Transcript

Click on a timestamp to play from that location

0:00.0

I doubt that the young Subramania and Shandr Shaker knew what he was getting himself into.

0:14.0

He was born in 1910 in the British Raj, and pretty much immediately everybody recognized

0:19.5

that he was an absolute genius.

0:21.6

He won prizes and competitions and scholarships.

0:25.1

And in 1930, he won a scholarship to attend Trinity College over in Cambridge.

0:31.2

And on his week's long voyage there, he worked out how white dwarfs worked.

0:36.4

And now this is where things get a little spicy.

0:39.1

One of his mentors and advisors and general persons I look up to was none other than Sir

0:45.2

Arthur Eddington. Up until this point, white dwarfs were known observationally. We started to see

0:52.3

these small, hot, bright white stars, and nobody knew how they

0:56.6

worked. And this mystery of what the heck are these white dwarfs that are so small, so dense,

1:03.4

so hot, like what's going on? Eddington gives us one of my favorite quotes in all of science

1:09.8

history. And I know I've said this quote

1:11.6

before, but it's been a while and it's worth giving again. Eddington said about white dwarfs,

1:16.9

especially one of the first identified white dwarfs, which was an orbital companion of the star

1:23.0

series. He said, we learn about the stars by receiving and interpreting the messages which their

1:29.6

light brings to us. The message of the companion of Sirius, when it was decoded, ran,

1:35.2

I am composed a material 3,000 times denser than anything you have ever come across. A ton of my

1:41.4

material would be a little nugget that you could put in a matchbox.

1:45.8

What reply can one make to such a message? The reply which most of us made in 1914 was,

1:52.9

shut up. Don't talk nonsense. So in comes Big Shandy. And I like calling him Big Shandy because

1:59.4

he's a big deal and we're we're cool like

...

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