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Galaxies are the areas visible accessible the Comet Observatory and Starship Mario. You have to collect so many stars to unlock the galaxy. They are the main sources and locations of where scattered stars fall. Some of the stars hide in the bosses of the galaxies, which gave them great power. Galaxies vary in sizes and difficulty.
A galaxy can be affected by a comet that's passing by, it can alter the order of planets, give a time limit, give Mario one health only, scatter purple coins, make foes faster, have a cosmic clone race the player, and scatter some Green Stars across the galaxy.
- Despite being called galaxies, they are more like groups of planets.