As a note, the manga is a lot less "hard" but no less enjoyable than the anime. For the anime they had a bunch of space folks consult to fix things up so if the space faring details bother you watch that.
Do you have a source for that? The manga I remember being quite accurate (though it's been a decade at least since I last read it). The anime diverges drastically story wise from the manga (the main characters are even different).
