Rockets, mobs, and more!
It looks like NASA is contemplating the idea of creating an education-oriented MMOG. An excerpt from the official website:
The NASA Learning Technologies (LT) project supports the development of projects that deliver NASA content through innovative applications of technologies to enhance education in the areas of science, technology, engineering and mathematics (STEM). Research and development are at the core of the LT mission. LT seeks to enhance formal and informal education in STEM fields with the goal of increasing the number of students in those fields of study and is currently investigating the development of a NASA-based massively multiplayer online educational game (MMO).
Read more at the official NASA site.