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Science Friday

What Lies Beneath The Outer Layers Of A Star?

Science Friday

Science Friday and WNYC Studios

Science, Life Sciences, Wnyc, Natural Sciences, Friday

4.46.3K Ratings

🗓️ 27 August 2025

⏱️ 13 minutes

🧾️ Download transcript

Summary

Astronomers found a supernova whose lighter outer layers had been stripped away, revealing an inner shell rich in silicon and sulfur.

Transcript

Click on a timestamp to play from that location

0:00.0

Hey, I'm Flor Lichtenen and you're listening to Science Friday.

0:06.9

Today in the podcast, astronomers caught a glimpse inside an exploding star and found some surprises.

0:15.5

We immediately realized this is something that we have never observed before, but we didn't know what we actually did observe.

0:27.3

You might think of a star as just a mass of incandescent gas.

0:31.8

The sun is a mass of incandescent gas, a gigantic nuclear furnace, where hydrogen is built into helium at a temperature of millions of degrees.

0:42.5

Yo-ho, it's hot the sun.

0:44.6

It is hot, but a new study suggests stars aren't just a big old mass of gas.

0:51.1

This week, researchers report that they've observed some of what lies beneath all of that

0:56.2

hydrogen and helium, at least inside one unusual supernova. And they found layers, like a giant

1:04.1

bloomin onion. Astronomer spotted this star in the act of exploding, and they were able to see one of those inner layers

1:12.5

after all that outer star stuff was stripped away.

1:15.8

Joining me now to talk about it is study author Dr. Steve Schulze.

1:19.5

They're a research associate at Northwestern University's Sierra.

1:23.1

That's the Center for Interdisciplinary Exploration and Research in Astrophysics.

1:28.2

Steve, welcome to Science Friday.

1:30.1

Hi, Flora.

1:30.7

Nice to meet you.

1:32.1

Nice to meet you, too.

1:33.2

So I've been trying to come up with the right analogy.

1:36.5

How off base is a giant bloom and onion?

1:40.1

This is absolutely perfect description.

1:43.7

I think you're being kind, but go ahead.

...

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