I was just blown away by the insane amount of thought and effort that went into every useless detail. In the manga volumes there are just pages of timelines, tons of maps of planets and solar systems, ridiculously comprehensive analysis of random character's wardrobe, explications of certain jobs and positions including details about their wages and fucking pension plans and tons of other insane details that are too many to mention. And that was just the stuff packed into the manga itself, I shudder to think of what the artbooks are like. It's like the guy wanted to single handedly outdo the scope and intricacy of big popular sci-fi universes like Star Trek within his 12 volume manga.