What is Universe Sandbox Legacy?
Universe Sandbox Legacy is an interactive space simulator for Windows-based PCs first released in 2008.
Unlike most astronomy software that just shows you what the sky looks like or where the planets are, Universe Sandbox is a powerful gravity simulator. You can add another star to our solar system and watch it rip the planets from their orbits.
The free-forever version allows you to explore and discover any simulation. Optionally you can upgrade to to the premium version for unlimited control.
What can you do with Universe Sandbox Legacy?
Explore our solar system
The solar system is so much more than the 8 planets. It's made up of thousands of asteroids, comets, and moons.
Blow up moons
Unleash destruction on a scale that you never dreamed was possible.
Line up the planets with a single click
Use the chart mode feature to line up the planets and moons. Then reorder them by mass or velocity.
Play pool in zero gravity
Break apart a rack of pool balls with such a light touch that gravity pulls them back together.
Rip Saturn's rings apart in 3D
Put on some 3D glasses to see Saturn's rings ripped away by a passing planet.
Destroy our solar system with a single rogue star
The aftermath of our solar system after a rogue star passes through the center.
View the paths of hundreds of asteroids & moons
Jupiter, it's 60+ moons, the 400 largest asteroids, and Earth and the other inner planets.
Compare the moons & dwarf planets
Compare the size of Pluto, our Moon, and everything else in the Solar System.
View our constellations from other stars
View the constellations from other stars and see how they warp and distort.
Make a football orbit a bowling ball
If baseballs and footballs (soccer balls) move slowly enough they can orbit a bowling ball.
Explore nearby galaxy clusters
Explore the galaxy cluster simulation to understand how big our universe really is.