Integration

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The Galaxy/Solar System thing is very likely a miscommunication between the writers and the animation team (which is in Japan, I believe) - they probably asked for a solar system to be drawn, and somehow this got translated as a galaxy. Happens more often than you imagine in animation, and actually, happened a LOT in actual classic art! Have you seen paintings or statues depicting the biblical Moses with horns? There are quite a lot of those... and they all stem from the translation mistake which translated the aramic text of the Old Testament as "Moses came down from the hill with the tablets, and there was a light over his head" as "horns over his head."