Yep, another Steam game.
If you're interested in the majestic workings of the universe, the stark beauty of a large rocky mass orbiting a ball of burning gases, and LAUNCHING STARS HUNDREDS OF TIMES LARGER THAN THE SUN, AT THE SUN, you might like Universe Sandbox.
I haven't fully explored all the features, but the detail it presents is quite amazing.
You can place planets, comets, asteroids, stars, even galaxies in the void of space, and watch as the game's extremely realistic physics go to work. After that, you can tweak the aforementioned celestial objects to your liking. You can change their diameter from several kilometers to thousands of AU (Astronomical Units) and everything in between. Size, mass, density, among several other parameters, can be changed to affect your little universe. You can also place dice, teapots, soccer balls and other man-made objects in space, and they act as a space-object.
If you don't feel like taking the time to build your own universe, the game has over 70 built-in simulations including a working model of our solar system, and the Death Star orbiting Endor.
http://universesandbox.com/
Looks fun, eh? I think so.
