08/22/25

What Lies Beneath The Outer Layers Of A Star?

12:12 minutes

A supernova illustration
An artist’s depiction of supernova 2021yfj. Credit: Adam Makarenko/W. M. Keck Observatory

You might think of a star as a mass of incandescent gas, a gigantic nuclear furnace where hydrogen is turned into helium at a temperature of millions of degrees. But researchers recently reported that they’d observed some of what lies beneath all that hydrogen and helium, at least inside one unusual supernova. The star, named supernova 2021yfj, had its outer layers stripped away, leaving behind a silicon- and sulfur-rich inner shell.

Astrophysicist Steve Schulze joins Host Flora Lichtman to describe what the team spotted in the heart of a dying star.


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Segment Guests

Steve Schulze

Dr. Steve Schulze is a research associate at Northwestern University’s Center for Interdisciplinary Exploration and Research in Astrophysics.

Segment Transcript

The transcript is being processed. It will be available 2-3 days after this story’s publication date.

Meet the Producers and Host

About Charles Bergquist

As Science Friday’s director and senior producer, Charles Bergquist channels the chaos of a live production studio into something sounding like a radio program. Favorite topics include planetary sciences, chemistry, materials, and shiny things with blinking lights.

About Flora Lichtman

Flora Lichtman is a host of Science Friday. In a previous life, she lived on a research ship where apertivi were served on the top deck, hoisted there via pulley by the ship’s chef.

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