Universe Sandbox Legacy

Universe Sandbox Legacy is a physics simulator that lets you mess with celestial objects and watch what happens. You can drag planets around, adjust their mass and velocity, then see gravity do its thing in real-time. Want to fling Earth into the Sun? Done. Build a stable three-star system? Give it a shot. The simulation runs actual gravitational calculations, so collisions, orbits, and momentum behave according to physics. You're free to start from scratch or load existing systems like our solar system and modify them. There's no campaign or objectives—it's a sandbox for testing cosmic what-ifs. Controls are straightforward: click, drag, tweak parameters. The visuals show trails, heat maps, and scale comparisons as bodies interact. Good for anyone curious about orbital mechanics or who just wants to crash moons into things without consequences.