MMO game project titled Astronaut: Moon, Mars and Beyond. While that project is still in the development stage, NASA is prepping to launch a (kind of) demo for the game called Moonbase Alpha. Now comes word from NASA Games' Twitter page that Moonbase Alpha will be released on June 6 for free via Steam.
The demo was supposed to be released way back in January but it apparently got delayed. Other than the fact that the game runs on Unreal Engine 3 there's little info on Moonbase Alpha at this point.
[Via Rock Paper Shotgun]