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Science Friday

Why Astronomers Are Excited About Comet 3I/ATLAS’ Close Approach

Science Friday

Science Friday and WNYC Studios

Science, Life Sciences, Wnyc, Natural Sciences, Friday

4.46.3K Ratings

🗓️ 19 December 2025

⏱️ 19 minutes

🧾️ Download transcript

Summary

Comet 3I/Atlas is just the third known object to visit us from outside our solar system. So yes... we'll be talking about aliens.

Transcript

Click on a timestamp to play from that location

0:00.0

Hey, I'm Flor Lickman, and you're listening to Science Friday. Today in the show, an attention-hogging, larger-than-life celebrity that everyone, and I mean everyone, seems to be talking about. Comet 3-E-E-A, Atlas. This dirty snowball is a visitor from another solar system, and it's only the

0:24.1

third interstellar object we've ever found. And today, today, it's closer to us than ever before,

0:31.9

a mere 170 million miles away. So naturally, space nerds like my next guess and me are really excited about

0:41.2

this, but 3i has permeated the astrophysicist bubble and captured the spotlight in a way that I think

0:48.3

maybe no other big hunk of rock ever has. We will talk about that too. Here to dish about this

0:54.0

interstellar luminary are my

0:55.6

guests, Dr. Stephanie Milam and astrochemist at NASA who studies comets and interstellar objects,

1:01.3

and Dr. Hakeem Olusheye, an astrophysicist who runs the Astronomical Society of the Pacific.

1:07.1

Stephanie Hakeem, welcome back to Science Friday. Thanks for having me.

1:11.5

Yes, thank you.

1:12.8

Stephanie, I know interstellar objects are your jam.

1:16.0

How pumped are you right now?

1:18.5

Super excited.

1:19.8

This has been a whirlwind of a year since the discovery in July,

1:25.5

and we are getting amazing data from telescopes on this object and

1:30.5

learning more and more each and every day about its origins, where it's from, and comparing that

1:37.5

to objects in our own solar system. I want to drill into that in a second, but, Hakeem, I know you're a space,

1:42.6

more of a space generalist.

1:47.7

Does it, does this rise to the same level of excitement for you?

1:53.5

Oh, it definitely does. And, you know, I'm just impressed with the field, right? It just keeps giving from images of supermassive black holes at the cores of galaxies to gravitational

2:00.2

waves of black holes colliding,

2:02.6

to now, you know, interstellar objects coming into the solar system.

...

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