Generation Ships

[Fred Brackin]

Originally Posted by Icelander

The paper studies and theoretical possibilities of one TL will often become the technology in common use at the next, which is what governs the assignment of TLs in GURPS.
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All true but Orion drives are TL7 concepts from the early 60s. If they had been pursued vigorously in some alternate timeline, perhaps one where the natural human Template includes Regen (Radiation Only) then they might have been ready in the TL8 period.

Spaceships includes a lot of things that are for deep alternates even if they aren't ^. The Nuclear Saltwater Rocket might be even more dangerous than the Orion drive.