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Bigmouth Galaxy is a bonus galaxy appear in Super Mario Galaxy. You have to feed a hungry Luma a few hundred starbits. It is one big planet NOT a galaxy. It's shaped like a big stone fish with a lake inside of it. It also consists of some outlaying aquatic planets. However none of them can be visited. You have to go in the lake and get the golden koopa shell to open up the golden chest, where comes out Captain Toad, which apparently fell in trying to get the star. This has only one star.