AaS! 54: What happens when galaxies collide?
Ask a Spaceman!
Paul M. Sutter
4.8 • 853 Ratings
🗓️ 18 April 2017
⏱️ 38 minutes
🧾️ Download transcript
Summary
What happens during a galaxy merger event? Is dark matter involved? How do we use simulations to learn about these processes that last hundreds of millions of years? I discuss these questions and more in today’s Ask a Spaceman!
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Music by Jason Grady and Nick Bain. Thanks to WCBE Radio for hosting the recording session, Greg Mobius for producing, and Cathy Rinella for editing.
Hosted by Paul M. Sutter, astrophysicist at The Ohio State University, Chief Scientist at COSI Science Center, and the one and only Agent to the Stars (http://www.pmsutter.com).
Transcript
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| 0:00.0 | You know what time. |
| 0:08.7 | And is this time for? |
| 0:09.4 | Ask a Space man. |
| 0:10.5 | I'm your host, Paul Sutter. |
| 0:11.5 | You've got questions and I've got answers. |
| 0:13.8 | You know how the show works. |
| 0:15.3 | But let's merge on that topic again. |
| 0:18.3 | Wow, that was like the one of the worst ones I've ever done. |
| 0:20.5 | Anyway, you go online to Twitter, Facebook. Use the hashtag Ask a Spaceman. |
| 0:25.4 | You can also ask me directly on Twitter Facebook. My handle is at Paul Matt Sutter. |
| 0:30.4 | You can also go to Ask aSpaceman.com, Ask aSpaceman at g-mail.com. Look up Ask a Spaceman on |
| 0:36.0 | YouTube. It's all there and it's all good. |
| 0:39.2 | And all questions about space and or time are welcome. We have a very simple goal with this show. |
| 0:46.2 | Complete knowledge of time and space. And on the road to complete knowledge of time and space, |
| 0:50.2 | we have a couple questions. One from Jamal via email. What happens when galaxies collide? Does |
| 0:56.6 | dark matter play a role? And then Danny N just copying off Jamal. Actually, I don't know which |
| 1:01.2 | one of these came first. Asking what happens when, you know, galaxies collide. We're used to in |
| 1:07.7 | astronomy that astronomical concepts, when we learn something about space, |
| 1:13.1 | it's either super old, like ancient peoples knew about constellations, motions in the heaven, |
| 1:22.6 | the existence of planets, the sun, the moon, all that, either thousands of years old or brand new. Like, |
| 1:31.6 | hey, guys, we just discovered yesterday this weird thing in space. And it seems like, |
| 1:37.3 | it seems like those are the only two options again. Either everyone through all of human history |
... |
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