Buoy Base Galaxy

The Buoy Base Galaxy is a galaxy that appears in Super Mario Galaxy. The galaxy contains a large fortress floating atop a large, spherical pool of water. Mario has to climb this fortress in order to get the main Power Star in this galaxy.

Buoy Base
The Buoy Base is the main part of the galaxy that is made of a large water area and an area above it which contains many obstacles along with a lower portion. The obstacles include Thwomps and Topmen. The main goal of this portion of the planet is to collect Star Chips to build a Pull Star that leads to the Aquatic Dome Planet. The bottom portion has Bill Blasters and a cage containing a Green Star.

Aquatic Dome
The Aquatic Dome Planet is a giant sphere filled with water above the Buoy Base. It has a screw on it that Mario must Star Spin to open the planet and retrieve the power star inside of it and also two pulse-wave generating machines, one of which is actually the screw. A power star is hidden inside. It is remarkably small in comparison to the Buoy Base, and is remarkably easier as well. It looks like a giant Poké Ball.

The Floating Fortress
In The Floating Fortress, the objective is to scale the fortress and receive the Power Star, located on a planetoid above the fortress. In order to do this, the player must first enter the pool of water and release the weight from within by directing the attacking Torpedo Teds towards the weight. Then Mario must begin his ascent, surviving the various traps that have been put in place to stop him, collecting the five blue star chips, to eventually lay out a path of Pull Stars towards the next planet. There, Mario has to head to the top of the planet, where it is opened by spinning on a gold screw.Then Mario/Luigi must dives in to retrieve the Power Star.

Secret of Buoy Base
This time, when Mario dives into the surrounding pool of water, he must seek out a caged green pipe, and open it by luring the Torpedo Teds into it. The pipe takes Mario to the outside of the planet, where Mario must lure Bullet Bills into a cage that contains the Green Power Star.

Enemies

 * Goombas
 * Torpedo Teds
 * Electrogoombas
 * Bloopers
 * Thwomps
 * Amps
 * Topmen
 * Bullet Bills
 * Astro Goombas
 * Pushy Walls
 * Urchins
 * Water Shooters

Trivia

 * The sphere containing the Power Star that hangs above the Buoy Base resembles a Poké Ball and opens like one too.
 * This is the only galaxy outside of the fifteen main galaxies and the Gateway Galaxy to contain multiple Power Stars.
 * It is 1 of 2 galaxies to have only 2 stars, the other being Gateway Galaxy.
 * There was a stage in the Super Mario Galaxy 2 trailer that looks strikingly similar to the Buoy Base Galaxy. Only that the platform where the 1up Mushroom (or perhaps, the pull star chip) has a switch that slows down time, since the rotating platforms are faster than in the original and are too fast for Mario to jump on them.