AaS! 137: What's really at the center of a black hole?

Ask a Spaceman!

Paul M. Sutter

Astrophysics, Science, Cosmos, Holes, Black, Astronomy, Natural Sciences, Universe, Cosmology, Space, Physics

4.8 • 853 Ratings

🗓️ 6 October 2020

⏱️ 33 minutes

🔗️ Recording | iTunes | RSS

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Summary

What can possibly replace the singularity? What are Planck stars and Gravastars? What’s it like to fall into a rotating black hole? 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 Cathy Rinella for editing.

Hosted by Paul M. Sutter, astrophysicist and the one and only Agent to the Stars (http://www.pmsutter.com).

Transcript

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1:00.9	So what really happens at the center of a black hole? Well, the short answer is, we don't know. And if you just want to
1:12.0	stop there, I won't blame you. Just end the episode, move on to the next, because that's exactly
1:17.8	the direction this show is going. We don't know. But if you're interested in the long answer,
1:23.6	well, listen on. We use general relativity to understand black holes.
1:31.0	In fact, that's how we predicted the very existence of black holes.
1:35.7	And that's where we get the language of the event horizon and the inescapable gravity.
1:42.5	And at the center of the black hole, when viewed in general relativity,
1:47.0	which is, like I said, our only way to view black holes right now,
1:51.6	at the center is something called a singularity.
	...

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