If you’re running a sci-fi RPG that involves interplanetary travel and you, like me, don’t know all that much about the details of planetary physics, then you owe this resource to yourself and your players. You’ll need to track along with some science and math, but author Mark Wightman keep it simple, always with an eye on helping the GM create interesting yet basically realistic planets. Aspiring sci-fi writers would benefit from this book, too.
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