Hi Cai! Love all these spacey questions =) Yes the solar system is actually shaped like a disk! This is for the same reason as the planets have their spin. In your earlier question about the Earth’s spin I think I explained how the solar system formed from a giant spinning cloud. Well that cloud also flattened as it spun and compressed (think about how pizza dough can get flattened as expert chefs spin the dough above their heads!). So all the planets and the Sun ended up forming in a plane. Our solar system is pretty flat!