Re: How has the science in Gurps Space 4th edition & Gurps Traveller held up?
Assuming you're comparing to GT:First In, Space 4th edition is basically a version update.
It's reasonably clear that our models for the formation of planetary systems were wrong, so the rules for generating the planets in a system are wrong. Once the planets are generated, figuring out habitability/etc hasn't really had much new data, so it's held up well enough.
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