i remember some pictures passing by that the planet lv-223 is a moon orbiting a gigantic saturnus-like planet, and moon lv-426 is orbiting a exactly similar gigantic planet, which theorizes it's in the same system and orbiting the same planet, actually. i never liked that or thought much of that, but it became general consensus somehow.
and i dont concider comics canon, ever. the movies are canon, they came first. the rest is fanboyism, even if its 'official comics'.