Black Holes can SPIN?!?

Most sources talk about Schwarzschild black holes, but those don't spin. Most are what we call Kerr black holes, or rotating black holes, surrounded by a region called an ergosphere. The spacetime around them is not only stretched, but also twisted, leading to some strange phenomena.
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VIDEO ANNOTATIONS/CARDS

Black Hole Playlist:
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The Ultimate Guide to Relativity:
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RELATED YOUTUBE VIDEOS

Veritasium on Spinning Black Holes:
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OTHER SOURCES

http://simbad.u-strasbg.fr/simbad/sim...
https://arxiv.org/abs/1410.2130
http://notizblock.yukterez.net/viewto...
http://www.madore.org/~david/math/ker...
https://www.nature.com/news/spin-rate...
https://www.nasa.gov/mission_pages/nu...
http://www.astro.ucla.edu/~ghezgroup/...
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LINKS TO COMMENTS

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IMAGE CREDITS

Supermassive Black Hole:
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Black Hole Eating:
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