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Tidal locking is when the rotation of a planet or moon is equal to its orbital period. It's actually quite common in our solar system and likely elsewhere. How does that actually happen though?

00:00 Cold Open
00:49 Resonance
03:24 Tidal Bulges
06:05 The Factors
09:14 Sponsor Segment
10:19 Outro
10:42 Featured Comment

Nick Lucid - Host/Writer/Editor/Animator
Sean Reese - Researcher
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VIDEO ANNOTATIONS/CARDS

Earth Surface Scale:
https://youtu.be/jffQVdJdoKQ

Life Cycle of the Sun:
https://youtu.be/GltTRdM1RW4
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RELATED YOUTUBE VIDEOS

MinutePhysics on Tidal Locking:
https://youtu.be/6jUpX7J7ySo
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OTHER SOURCES

General Info:
https://www.pas.rochester.edu/~blackman/ast104/tidal.html
https://www.haydenplanetarium.org/tyson/essays/1995-11-the-tidal-force.php
https://phys.org/news/2013-10-explanation-rotational-state-mercury.html
https://www.nasa.gov/mission_pages/MRO/news/mro-20080409.html
https://www.eso.org/public/outreach/eduoff/vt-2004/Background/Infol2/EIS-A3.html
https://solarsystem.nasa.gov/moons/saturn-moons/in-depth/
https://solarsystem.nasa.gov/moons/pluto-moons/charon/in-depth/
https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html
https://nssdc.gsfc.nasa.gov/planetary/factsheet/moonfact.html

Deeper Reading:
https://www.sciencedirect.com/science/article/pii/S0019103596901177
https://www.aanda.org/articles/aa/full_html/2011/04/aa15809-10/aa15809-10.html
https://link.springer.com/article/10.1007/s10569-017-9783-7
https://royalsocietypublishing.org/doi/pdf/10.1098/rspa.1909.0008

"Mercury" by T.J. Mahoney
https://books.google.com/books?id=iC65BAAAQBAJ&pg=PA44 

"Physics and Chemistry of the Solar System" by John Lewis
https://books.google.com/books?id=35uwarLgVLsC&pg=PA242

"Solar System Dynamics" by Carl D. Murray, Stanley F. Dermott
https://books.google.com/books?id=aU6vcy5L8GAC&pg=PA184
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LINKS TO COMMENTS

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https://www.youtube.com/watch?v=zYRx6Zub3cA&lc=UgyHLhrH-wv2bkjBDLh4AaABAg
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IMAGE CREDITS

Moon Phases:
https://svs.gsfc.nasa.gov/4874

Tide Animations:
https://moon.nasa.gov/moon-in-motion/tides/

Mars's Moons:
https://mars.nasa.gov/resources/6141/martian-moon-deimos-in-high-resolution/
https://mars.nasa.gov/resources/6989/mars-moon-phobos/

Jupiter's Moons:
https://photojournal.jpl.nasa.gov/catalog/PIA00583
https://photojournal.jpl.nasa.gov/catalog/PIA19048
https://photojournal.jpl.nasa.gov/catalog/PIA00716
https://solarsystem.nasa.gov/resources/217/capturing-callisto/?category=moons/jupiter-moons_callisto

Saturn's Moons:
https://photojournal.jpl.nasa.gov/catalog/PIA21624
https://solarsystem.nasa.gov/moons/saturn-moons/rhea/in-depth/
https://solarsystem.nasa.gov/moons/saturn-moons/iapetus/in-depth/

Pluto and Charon:
https://www.nasa.gov/feature/pluto-and-charon-new-horizons-dynamic-duo

Trappist-1:
https://www.nasa.gov/image-feature/jpl/PIA21751/trappist-1-system-artist-concept