The Future Is Yours! GURPS Space puts campaign-planning advice and space science at your fingertips, so you can create a setting that is plausible and fun! It's the ultimate toolkit for building strange new worlds and alien civilizations. GURPS Space will help you create campaigns of every style, from science fantasy to space opera to realistic. Recreate your favorite science-fiction background, or develop an original world of your own. With GURPS Space in your hands, the future is yours! GURPS Space requires the GURPS Basic Set Fourth Edition. The information and advice on technology, world-building, and alien design can be used as a resource for any space-based game. This softcover printing is black and white (grayscale). A version with color interior pages is also available separately.
GURPS Space has two things going for it. The first is the best (or at least closest to scientifically plausible) random world and star system generation rules on the market (although the hardcover has a glitch in the lunar tidal force equation which is corrected in the PDF). The second is a alien generation system which is an update of the fascinating system used in GURPS Uplift.
Fantastic source manual for creating speculative fiction settings for gaming or story-telling. The text adequately reduces to understandable models a number of key astrophysics elements defining our current understanding of stellar mechanics, while also suggesting copious ideas drawn from exemplary fiction on how to set stories in such locales.
This is my go to book when it comes to star system generation. By far the best Sci-Fi world building system I came across, so far, for pen and paper RPGs, anyway. It's a bit time consuming if you do it on paper, but at the end of the process you have a scientifically sound star system and you might even learn a bit of basic astronomy along the way.
This book laid the foundation for the world I first brought to life as a role-playing game—and later transformed into my novel, [Echoes of the Final Battle](https://www.goodreads.com/book/show/2...).