There is also
Second Life that will impress any undergrad. In the International Space Museum (ISM) area, there are numerous displays, some interactive, and JPL has recently added a lot of new displays. Not only are there full-scale space rockets and spacecraft (eg Hubble Telescope), but there are interactive planetary displays.
I have been very impressed with what has been acomplished at the ISM and surrounding science "islands". [I have not been impressed with much of the risque rest, though there are stunning exceptions.] The ISM teleport coordinates are 48, 82, 24. If interested, let me know if you would like a list of astronomy related sites and coordinates.
Oddly, and it is unclear what I have said or done, but I am now an ISM staff member. Perhaps I could arrange a class tour with someone from JPL or an infamous heliochromologist, worse case.
