If I may grossly mangle Arthur Clarke, here:
Any sufficiently advanced technology that hard-SF readers have been swallowing for decades is indistinguishable from a technology that Civ players will swallow to get to Alpha Centuari.
An AC tech tree could go:
1. Hydrogen fusion
2. Hyper-magnetics
3. Magnetic shielding
4. Astro-navigation
5. Psychological profiling
Most could have civil/military uses as well.
We'll assume, for tradition's sake, that there's an earth-like planet orbiting AC.
I don't see why that wouldn't be acceptable.
Any sufficiently advanced technology that hard-SF readers have been swallowing for decades is indistinguishable from a technology that Civ players will swallow to get to Alpha Centuari.

An AC tech tree could go:
1. Hydrogen fusion
2. Hyper-magnetics
3. Magnetic shielding
4. Astro-navigation
5. Psychological profiling
Most could have civil/military uses as well.
We'll assume, for tradition's sake, that there's an earth-like planet orbiting AC.
I don't see why that wouldn't be acceptable.
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