AaS! 268: What are Little Red Dots?
Ask a Spaceman!
Paul M. Sutter
4.8 • 853 Ratings
🗓️ 17 March 2026
⏱️ 32 minutes
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Summary
What do we find when we push the James Webb Space Telescope to its limits? Are Little Red Dots newborn galaxies or old black holes? What are they teaching us about the early universe? I discuss these questions and more in today's Ask a Spaceman!
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Transcript
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| 0:00.0 | I just love astronomers. |
| 0:08.4 | They're so cute sometimes. |
| 0:12.3 | Every time they see something new in the sky, they give it a new name. |
| 0:15.8 | And then we all have to figure out if what they were seeing fits the name or not. |
| 0:20.0 | Sometimes the name changes, like what they call nebula, some of the nebula turned out |
| 0:23.6 | to be galaxies, so those got a new name. |
| 0:25.6 | And sometimes it stays the same, like they identified quasars, and then those stayed as quasars. |
| 0:30.6 | Although that's complicated because they're also active galactic nuclear, or AGM, which is a broader |
| 0:35.6 | category than Kluska anyway. |
| 0:36.6 | No matter what, it seems like with every new telescope, every new observatory, |
| 0:41.5 | every new campaign, we get a new list of, here's a collection of astronomical objects that |
| 0:46.1 | don't fit previously known collections, so we bought all these new ones in a bucket of their |
| 0:50.2 | own and slapped a label on it. |
| 0:52.1 | Case in point, the subject of today's episode, Little Red Dots. |
| 0:57.7 | That's it. |
| 0:58.7 | That's their name. |
| 0:59.9 | Now, of course, astronomers, perhaps out of a small sense of embarrassment, usually in |
| 1:04.3 | their papers call them LRDs, just like they would say A-G-N. |
| 1:08.5 | But active galactic nucleus is way, way more awesome than Little Red Dots. |
| 1:12.7 | So sorry, you can't hide from us. |
| 1:15.1 | We know what you're doing. |
| 1:16.9 | Little Red Dots are, well, to be fair, that's a pretty descriptive name for what we're seeing. |
... |
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