If you already own Universe Sandbox ², just run Steam to update to the latest version.
Or you can buy Universe Sandbox ² here:
http://universesandbox.com/buy/What's new?Alpha 11.3
Just a small fix to a bug we introduced in Alpha 11.2 when initializing Earth’s climate that made our planet too cold. This also fixes an issue with the game window forcing itself on top of other windows.
Alpha 11.2
We've added 64 bit Windows and Linux versions (to the existing 32 bit versions). When you launch the game on Steam it will automatically run the best version for your operating system. We also improved the Auto Orbit command and fixed a couple small bugs.
Alpha 11.1
We’ve overhauled the star database and in the process fixed a number of issues related to star properties. We also improved the create panels and fixed a few more bugs.
Alpha 11
We’ve added shockwaves to collisions, improved supernova visuals, and added a choreography tool for creating interesting orbital patterns. We also addressed some larger bugs, including switching out our Steamworks integration to fix startup issues for Linux users.
Complete List of UpdatesLet us know what you think! And please report any problems either with the in game feedback tool or by starting a new thread...