From the introduction: Arguably the lifeblood of a space based campaign, a party’s ship is often their character’s homes, livelihood and entry to adventure. The purpose of this system is not to realistically simulate space flight and combat, but rather to provide a Hard Sci-Fi gaming experience using real world physics as a basis for abstract tabletop rules. As such, a fair amount of hand waving is done, favoring ease of play over unnecessary granularity. User summary: This item utilizes a modified 5th Edition rule set: see Fifth Age.