I just saw this on Steam and remembered how some of you like stuff about space, so I decided to share.
http://www.youtube.com/watch?v=v6shurn2W0wIt's exactly what it says on the title. Play with the solar system, create galaxies, stars, black holes...there's a lot of things to do.
There is a free version, but it only allows you to view pre-created simulations. The site, however, has a 1 hour trial version with all the features.
It's $20 USD on the site (
http://universesandbox.com/ ), but for some reason, $10 USD on Steam, go figure. =P
So...go check it out? Have fun destroying the universe.
Another video:
http://www.youtube.com/watch?v=Avy-PTi5e9Y