Re: How has the science in Gurps Space 4th edition & Gurps Traveller held up?
Sol-like systems are out there.
But, you could come up with interesting things to do in space with a system that has a Hot Jupiter. Good place for pirates to hide, if there are no useful worlds (if you're doing a more space-opera sort of thing where space pirates can be a thing).
Also, a Jupiter-mass planet in the liquid water zone could have a Ganymede-sized moon with happy life tooling around on it, or human colonies.
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