The NASA MMO, still being in the infant stages of searching for an actual developer, is interested in making this the first educational MMO using the "STEM discipline". This promotes Science, Technology, Engineering, and Mathematics within the game to get people interested in these subjects, and help them better understand how to pursue a career incorporating these skills. If you think about it, many MMOS already use this system, but the trick is disguising it in a thin veil of fun. That is the biggest challenge to creating a government-sponsored online game that aims to educate a particular target audience. But with the recent insane growth of games like EVE Online, we don't think the target audience will be a problem.