Re: [Space] Making a solar system with 3 (semi-) habitable planets?
Not sure if this is GURPS-compatible or not (don't have Space) but have you considered using a gas giant?
The goldilocks zone for a typical star seems too small to allow multiple planets. But multiple moons might be doable, if you're willing to endure some weird scenery. (A double-planet satisfies this as well).
Another way to stretch the habitable band might be to have a much larger world with a much denser atmosphere as your outer planet. The greenhouse effect could buy you a little wiggle room that way.
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