Gravity simulator
A lightweight Newtonian gravity playground for intuition about how planets and galaxies interact.
Sun–Earth (two-body orbit)
Normalized demo: circular orbit in dimensionless units (not to scale).
Interpretation
This is a simplified Newtonian gravity demo. It is excellent for intuition (orbits, binding, flybys), but real planetary dynamics and galaxy evolution include many more effects (non-spherical mass, perturbations, relativistic corrections, gas dynamics, feedback, etc.).