🌌
Solar Sandbox
Newtonian N-body solar system. Real masses, time warp, and Universe-Sandbox-grade chaos buttons.
Newtonian N-body gravity — real masses, radii, and Keplerian starts. Click a world for its dossier; sandbox tools let you gently ruin the neighbourhood.
Universe tools
Click a body to inspect. Drag empty space to pan.G multiplier ×1
Softening 1.0e-5 AU
Select a body
Click any world in the viewport.
Bodies
Scroll to zoom · drag to pan · Space pause · F follow · R reset · Del delete.
Units: AU, M☉, days. Integrator: velocity Verlet with adaptive substeps — close encounters automatically get finer time resolution. Not a flight computer — fun first, ephemeris second.
Stars can be detonated from the dossier; the outcome (nova, supernova, remnant type) depends on mass, and a white dwarf fed past 1.4 M☉ goes Type Ia on its own.
Moons are drawn at exaggerated distances from their planets so they're visible — the simulation uses their true, much tighter orbits.
Fictional systems use invented-but-plausible masses and orbits; the gravity is just as real.