Most Galaxies are Moving Faster than Light!

To understand how the universe can expand faster than light, we need to understand how causality works in Einstein's general relativity.

HUGE thanks to Dianna Cowern for helping make this video more relatable!
   / @physicsgirl  
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VIDEO ANNOTATIONS/CARDS

The Cosmic Microwave Background:
   • Cosmic Microwave Background: The Olde...  

What is Time?!
   • What the HECK is Time?! (in Einstein’...  

Cosmic Horizons:
   • Is the Universe a giant Black Hole?  
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RELATED YOUTUBE VIDEOS

Domain of Science on FTL Galaxies:
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IMAGE CREDITS

Andromeda Galaxy:
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Cosmic Microwave Background:
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Derek Muller:
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TIME CODES

00:00 Cold Open
00:31 Light is slow.
01:49 Universal speed limit? Not really.
02:36 Causality
04:00 Why are galaxies going so fast?
05:20 Hubble Horizon
06:43 Comoving Frame
08:05 Peculiar vs Recession Velocity
10:15 Doppler vs Cosmological Redshift
11:24 Summary
12:01 Outro
12:18 Featured Comment