Sign Up on Patreon to get access to the Space Time Discord!
Sign up for the mailing list to get episode notifications and hear special announcements!
Check out the Space Time Merch Store
If there’s one thing cooler than a black hole it’s a rotating black hole. Why? Because we can use them as futuristic power generators, galactic-scale bombs, and portals to other universes.
Hosted by Matt O’Dowd
Written by Matt O’Dowd
Graphics by Leonardo Scholzer, Yago Ballarini, & Pedro Osinski
Directed by: Andrew Kornhaber
Executive Producers: Eric Brown & Andrew Kornhaber
Black holes are self-sustaining holes in the fabric of spacetime. Space at the event horizon cascades downwards, dragging more space behind it, sort of like how water drags itself near the edge of a waterfall. In a Kerr black hole, space above the event horizon is dragged around in a circle – so less waterfall and more whirlpool. Water spiraling down a drain in a flat sink doesn’t know about the hole – it only knows about the motion of the water around it. In fact it’s possible to construct a black hole in general relativity rotating or otherwise – without any mass. Warp spacetime so it looks like the exterior of a black hole, and that warping will persist. So what is rotating? Spacetime is rotating.
Special Thanks to our Patreon Sponsors
John R. Slavik
Gamma Ray Burst Supporters
Nickolas Andrew Freeman