Galaxy

A Galaxy is an enormous system consisting of gases, stars, Planets, and Comets. Mario visits many galaxies in his adventures through Super Mario Galaxy. The galaxy named Grand Finale Galaxy is home to Mario's planet (Mushroom World),  while the Milky Way Galaxy is home to Earth. The galaxies in Super Mario Galaxy are notably much smaller than real galaxies, often being comprised of nothing more than a few small planetoids.

Notable Galaxies
B D F G H L M R S T
 * Battlerock Galaxy
 * Beach Bowl Galaxy
 * Bonefin Galaxy
 * Boo's Boneyard Galaxy
 * Bowser Jr.'s Airship Armada
 * Bowser Jr.'s Lava Reactor
 * Bowser Jr.'s Robot Reactor
 * Bowser's Dark Matter Plant
 * Bubble Blast Galaxy
 * Bubble Breeze Galaxy
 * Buoy Base Galaxy
 * Deep Dark Galaxy
 * Dreadnought Galaxy
 * Drip Drop Galaxy
 * Flipswitch Galaxy
 * Gateway Galaxy
 * Ghostly Galaxy
 * Good Egg Galaxy
 * Grand Finale Galaxy
 * Gusty Garden Galaxy
 * Honeyclimb Galaxy
 * Honeyhive Galaxy
 * Hurry-Scurry Galaxy
 * Loopdeeloop Galaxy
 * Loopdeeswoop Galaxy
 * Matter Splatter Galaxy
 * Melty Molten Galaxy
 * Milky Way Galaxy
 * Rolling Gizmo Galaxy
 * Rolling Green Galaxy
 * Sand Spiral Galaxy
 * Sea Slide Galaxy
 * Sling Pod Galaxy
 * Snow Cap Galaxy
 * Space Junk Galaxy
 * Sweet Sweet Galaxy
 * Trial Galaxies