I’m interested in that too, I think we should have let the Russians have the moon landing and taken the Freeman Dyson model to Mars and beyond. But hardcore physics and technical aspects I don’t know diddly squat.
Nicknamedbob, Dead Corpse, and Darksheare do most of the hard-science discussion. I know just enough about physics to say something that sounds rather scienc-y when my children ask me about it. I’ve read some Richard Feynmann books!
We didn't use project Orion, though. We used our Gas-Cooled Nuclear Reactor/Rocket Engines, or as we call them, Shuttles.