Sounds awesome[ly boring]. Kind of like Star Wars Galaxies, except without the bounty hunters, strange creatures, space pirates, blasters, or anything else that was cool.
Nasa: NASA Goes Massively Multiplayer With Astronaut

NASA wanted a massively multiplayer online game, and now they’re getting one, signing three separate development studios to work on Astronaut: Moon, Mars, and Beyond.
While video game players have long dreamed of traveling into the stars and meeting exotic alien species, real outer space is relatively boring. Now NASA seeks to change all of that with the development of a massively multiplayer online exploration game called Astronaut: Moon, Mars, and Beyond. NASA has selected three development studios to work on the project – Project Whitecard, Information in Place, and Virtual Heroes – the last of which did work on America’s Army.