Adding a third celestial body to a gravitational system makes things wildly chaotic and unpredictable. Hence the 'Three Body Problem'. Some beautiful examples of periodic 3-body systems:

(via instagram user data__is__beautiful)

@infobeautiful the tidal charts on some of these planets must be wild.

@infobeautiful
The #older amongst us remember the figures you the when you feed different #periodic signals in the x- and y-deflection of an #Oscilloscope

Often seen in these #pictures from 1966

https://www.imdb.com/de/title/tt0061289/

@infobeautiful these are beautiful and also remind me of spirograph 😊
@infobeautiful I wonder if there are actually any such systems in the real universe.
@ondrej_zizka @infobeautiful I feel like the chance for any of them to (naturally) become stable like in the video over a long time would be extremely low.

@infobeautiful Maybe related: double pendulums

https://youtu.be/dtjb2OhEQcU

Double Pendulums are Chaoticn't

YouTube
@infobeautiful And this makes for a cool wallpaper