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How Does Gravity Escape A Black Hole?

2022-01-27 Education
1.6m
40.5k
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PBS Space Time
PBS Space Time
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PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE Take the Space Time Fan Survey Here: https://forms.gle/wS4bj9o3rvyhfKzUA Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Fact: in a black hole, all of the mass is concentrated at the singularity at the very center. Fact: every black hole singularity is surrounded by an event horizon. Nothing can escape from within the event horizon unless it can travel faster than light. Fact: gravity travels at the speed of light. So how does a black hole manage to communicate its gravitational force to the outside universe? How does gravity escape a black hole? Check out the Space Time Merch Store https://www.pbsspacetime.com/shop Sign up for the mailing list to get episode notifications and hear special announcements! https://mailchi.mp/1a6eb8f2717d/spacetime Hosted by Matt O'Dowd Written by Matt O'Dowd Post Production by Leonardo Scholzer, Yago Ballarini, Pedro Osinski, Adriano Leal & Stephanie Faria GFX Visualizations: Ajay Manuel Directed by Andrew Kornhaber Assistant Producer: Setare Gholipour Executive Producers: Eric Brown & Andrew Kornhaber Executives in Charge (PBS): Adam Dylewski, Maribel Lopez Director of Programming (PBS): Gabrielle Ewing Spacetime is produced by Kornhaber Brown for PBS Digital Studios. This program is produced by Kornhaber Brown, which is solely responsible for its content. © 2021 PBS. All rights reserved. End Credits Music by J.R.S. Schattenberg: https://www.youtube.com/user/MultiDroideka Special Thanks to Our Patreon Supporters Big Bang Supporters David Taiclet Ben Dimock Daniel Alexiuc Nenado763 Pravin Mansukhani Peter Barrett Nils Anderson David Neumann Charlie Leo Koguan Sandy Wu Matthew Miller Ahmad Jodeh Alexander Tamas Morgan Hough Juan Benet Vinnie Falco Fabrice Eap Mark Rosenthal David Nicklas Henry Van Styn Quasar Supporters Alex Kinsey Alex Kern Ethan Cohen Stephen Wilcox Yogi B Christina Oegren Mark Heising Hank S Hypernova Supporters William Bryan drollere Joe Moreira Marc Armstrong Scott Gorlick Nick Berard Paul Stehr-Green Alexander Price MuON Marketing Russell Pope Ben Delo Nicholas Newlin Scott Gray Антон Кочков John R. Slavik Mathew Donal Botkin John Pollock Edmund Fokschaner Joseph Salomone chuck zegar Jordan Young m0nk Daniel Muzquiz Gamma Ray Burst Lillith Montgomery Avi Yashchin MHL SHS Kory Kirk Terje Vold Anatoliy Nagornyy comboy Brett Baker Jeremy Soller Jonathan Conerly Andre Stechert Ross Bohner Paul Wood Kent Durham jim bartosh Nubble Chris Navrides Scott R Calkins The Mad Mechanic Ellis Hall John H. Austin, Jr. Diana S Ben Campbell Lawrence Tholl, DVM Faraz Khan Almog Cohen Alex Edwards Ádám Kettinger MD3 Endre Pech Daniel Jennings Cameron Sampson Pratik Mukherjee Geoffrey Clarion Nate Darren Duncan Russ Creech Jeremy Reed Eric Webster David Johnston J. King Michael Barton Christopher Barron James Ramsey Justin Jermyn Mr T Andrew Mann Isaac Suttell Devon Rosenthal Oliver Flanagan Bleys Goodson Robert Walter Bruce B Ismael Montecel Simon Oliphant Mirik Gogri Mark Delagasse Mark Daniel Cohen Brandon Lattin Nickolas Andrew Freeman Shane Calimlim Tybie Fitzhugh Robert Ilardi Eric Kiebler Craig Stonaha Martin Skans The Art of Sin Graydon Goss Frederic Simon Tonyface John Robinson A G David Neal Kevin Lee justahat John Funai Cass Costello Tristan Bradley Jenkins Kyle Hofer Daniel Stříbrný Luaan AlecZero Vlad Shipulin Cody Malte Ubl King Zeckendorff Nick Virtue Scott Gossett Dan Warren Patrick Sutton John Griffith Daniel Lyons DFaulk Kevin Warne Andreas Nautsch

Top Comments (10)

@j.d.6915 2022-01-27

How does gravity escape a black hole? Very, very carefully.

2.0k 60 replies
@TheBuzzBen 2022-01-30

Question. What happens if a gravitational wave passes through a black hole? Would we have gravitational lensing of gravity? If so, can gravity be focused on a single point making a virtual black hole without mass?

1.5k 118 replies
@dannymac6368 2022-01-27

Fact: PBS Space Time is a black hole I’m always happy to fall into. Captivating, radiating information constantly…it fits.

479 9 replies
@Bizzmark11 2026-01-30

Man, I'm glad I watched all the way to the end. I was going to mess around near a black hole later, but now I know better!

4
@SteenSchütt 2022-01-27

This just made this whole "imprinted on the surface of the event horizon" thing click for me. I simply hadn't connected the dots between that, and the infinitely stretched light. Great video 💡

114 2 replies
@Themaniacis_back 2022-01-31

I have the utmost respect for any channel that is willing to admit when they made a mistake and correct themselves. It seems like so many are terrified to admit when they are wrong these days. It's okay to be wrong sometimes. We are human. Anyways, keep up the great work.

401 10 replies
@siahenderson1490 2022-01-28

I wanna take a moment to appreciate Matt .he has unknowingly been my teacher since I was 15...I'm 22 now and a grad student.. Videos like this teach more than schools

239 32 replies
@ryanking9217 2026-01-29

The “apparently” stuck at the event horizon line of thought was recently mentioned as a way of explaining that there may be no actual singularities in the universe. From the outside perspective, every black hole is still in the process of collapsing and will never produce a singularity.

32 2 replies
@syntaera 2022-01-27

For SR/GR, it's more helpful to view 'c' not as a speed, but as a geometric *conversion* factor between distances and times in a four-dimensional space-time. The 'speed' of light is an emergent phenomenon of treating different speeds as merely relative rotations of an object into spatial directions and away from the time-oriented observer/rest frame. A 90 degree rotation away from travelling 1 second per second through time results in an apparent motion of 299792458m per second in space - while simultaneously extruding the observed travel-direction length backwards into the time direction, resulting in observed length contraction. Treating 'c' as a mere speed is easier mentally, but ultimately makes SR/GR harder to understand.

362 53 replies
@DanHarkless_Halloween_YTPs_etc 2022-04-05

8:06 - "Interactions between particles result from the sum of all virtual particle interactions, possible and impossible, and the speed of light limit actually emerges in a sort of statistical way." 🤯 This really is the best channel on YouTube (according to my information-theoretical measurements, anyhow)!

5

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