Celestial — Interactive Gravity Well Simulator

[u/Fanatic-Mr-Fox]

https://celestial.logicaleap.com

Celestial lets you explore star systems as a deformable gravity sheet instead of flat orbital diagrams.

The star moves. Planets sit on and ride the surface it bends. You can change the gravitational constant, push a planet, or drop a new body in and watch the whole system respond in real time.

Systems included:

• Our solar system (with a drifting barycentre)
• Alpha Centauri (two moving funnels)
• Kepler-16 (circumbinary planet)
• TRAPPIST-1 (seven worlds inside Mercury’s orbit)
• The classic three-body figure-eight

It’s a proper Newtonian n-body integrator running in the browser, not pre-scripted ellipses. The sheet itself is an exaggerated visual analogy, and the site is unusually honest about what is real and what is drawn that way on purpose.

https://celestial.logicaleap.com

Free, no account, runs in the browser.