Ok, so here's another Hard-SF link. Orion's Arm is a collaborative world-building group that has built a huge universe that tries as hard as possible to be scientifically accurate (as far as we understand the physics and such at the moment).
This link is to their encyclopedia area where you can browse around. I like it, cause if you're ever wondering how an antimatter drive would work, you can look it up here with fairly high confidence that the explanation you'll get is accurate.
Enjoy!
Later . . . .
