The Only Moons That Trade Places

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Saturn's moons Janus and Epimetheus were once thought to be the same moon. It turns out they're dance partners.

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Sources:

https://www.mattech-journal.org/articles/mattech/full_html/2017/05/mt180002/mt180002.html
https://academic.oup.com/astrogeo/article/52/1/1.44/204256
https://solarsystem.nasa.gov/moons/saturn-moons/janus/in-depth/
https://ui.adsabs.harvard.edu/abs/2005BAAS...37.1558P/abstract
https://solarsystem.nasa.gov/moons/saturn-moons/epimetheus/in-depth/
https://www.science.org/doi/10.1126/science.197.4306.915
https://www.planetary.org/articles/janus-epimetheus-swap
https://solarsystem.nasa.gov/moons/saturn-moons/janus/in-depth/
https://iopscience.iop.org/article/10.3847/1538-4357/aa9c7f

https://science.nasa.gov/resource/cruising-past-janus-2/
https://en.wikipedia.org/wiki/File:PIA12714_Janus_crop.jpg
https://www.gettyimages.com/detail/photo/janus-sculpture-royalty-free-image/481641845?phrase=janus&adppopup=true
https://en.wikipedia.org/wiki/Epimetheus_(moon)#/media/File:Animation_of_Epimetheus_orbit_-_Rotating_reference_frame.gif
https://www.gettyimages.com/detail/video/planet-saturn-and-moons-detailed-close-up-stock-footage/1186141755?adppopup=true
https://www.youtube.com/watch?v=X5wP5FSwTPo&ab_channel=NASASTIProgram
https://www.nasa.gov/image-article/lucy-mission-study-trojan-asteroids/
https://commons.wikimedia.org/wiki/File:PIA08170_Epimetheus_and_Janus.jpg
https://science.nasa.gov/resource/saturns-rings-2/
https://www.planetary.org/articles/1249