I LOVE this book. I wish I could give it 6 stars. It is crunchy without being too crunchy and gives you great explanations of why the formulas and randomness are used. He also provides extensive references in each section if you want to dive deeper. I love this book so much.

Wow! A great deal of work went into making that book!

This book allors you to build your worlds by going through 31+ steps of star and planetary formation, based on today's science with all references (and where hypothesis and simplification are made), to make some awesome realistic worlds for your games and stories!

I would recommand that book for everyone that want to build a world from scratch. Though if you have a special thing in mind, you have a chapter for all those, with instruction to how to adjust the process., Be sure to check them out before going through all the process.

Superb bit of space gaming usefulness. Makes adding the realism of fuel/remass usage to most 'build your own' games (or pre-designed, if you want to make more judgement calls). Three settings of fuel usage for speedy tactical (Full Thrust), slower tactical (Starmada), or slowest 'operational' (Triplanetary). Efficiency options give you plenty of wiggle room for tech levels within each 'setting'. It's one of those things that make me slap my forehead and say, 'Of course!' If you've any interest in even vagely realistic space gaming, this is worth every penny (and I'm usually hard on the more expensive per page PDFs, so).