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The John Batchelor Show

S8 Ep211: DISCOVERY OF GIANT RADIO GALAXIES AND SUPERMASSIVE BLACK HOLES Colleague Dr. Sabayashi Pal. Astronomers have discovered 53 giant radio galaxies, some 75 times larger than the Milky Way, powered by active supermassive black holes emitting radio jets. These

The John Batchelor Show

John Batchelor

News, Arts, Books, Society & Culture

4.52.8K Ratings

🗓️ 19 December 2025

⏱️ 13 minutes

🧾️ Download transcript

Summary

DISCOVERY OF GIANT RADIO GALAXIES AND SUPERMASSIVE BLACK HOLES Colleague Dr. Sabayashi Pal. Astronomers have discovered 53 giant radio galaxies, some 75 times larger than the Milky Way, powered by active supermassive black holes emitting radio jets. These ancient objects offer insights into galactic evolution, contrasting sharply with the Milky Way's smaller, dormant black hole that allows life to exist safely. NUMBER 13
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Transcript

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0:00.0

At Pluralsight, we don't just teach skills.

0:02.8

We are building the tech workforce, who deliver results fast, accelerated by top-tier content.

0:08.6

Lead with confidence, lead with expertise.

0:11.1

Visit us at Pluralsight.com to tap in and learn more.

0:20.2

This is CBS Eye on the World.

0:23.5

Here's John Batchelor.

0:26.8

This is CBS Eye on the World.

0:29.4

Hotel Mars, episode N.

0:31.0

David Livingston, Dr. Space is here, my colleague and co-host and co-pilot.

0:35.6

And we're off to India, to West Bengal State.

0:40.6

Midnipur is the name of the suburb of Calcutta, and we join Associate Professor Head of the Department of

0:47.7

Pure and Applied Sciences, Sabayashi Powell, who is going to introduce us to a new discovery and the significance of it for cosmology.

0:59.0

Supermassive black hole-powered quasars.

1:04.6

Just discovered, 53 of them, and what does this mean?

1:09.1

Professor, you are going to help us understand a type of astronomy

1:15.1

that is based on the giant radio quasars what is a quasar and how is it you've perceived it with

1:22.9

radio waves good evening to you yeah thank you Thank you very much, John. Good evening, everyone. So we all know

1:32.6

how typical galaxy looks like in optical wavelength. Either it looks like an ellipside or it looks

1:40.9

like a spiral. So usually there's two kind of galaxies in optical wavelength, either optical galaxies

1:48.4

or spiral galaxies.

1:51.0

But in radio wavelength, it looks totally different.

1:55.6

For a fraction of optical galaxies, they make jets.

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