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.