Here is info from my Epcot Times Guide from July 2003:
Future World does close at 6.
However, Innoventions closes at 7, Honey I shrunk the Audience, Leave a Legacy, Spaceship Earth and Test Track all close at 9 pm.
I would think they would have Mission Space open until 9 as well, although I don't have any official info. Obviously, it's going to be the most popular ride in Epcot.