World 5 (Super Mario Galaxy 2)

World 5: Trial of the Galaxies is the fifth world featured in Super Mario Galaxy 2. It is located very very high in the atmosphere of the Mushroom World, which can be seen from the map actually. It holds seven galaxies, the last of which, Bowser Jr.'s Boom Bunker, features the third and last encounter with Bowser Jr., who attacks with his Boomsday Machine.

Galaxies

 * Space Storm Galaxy
 * Slipsand Galaxy
 * Shiverburn Galaxy
 * Boo Moon Galaxy
 * Upside Dizzy Galaxy
 * Fleet Glide Galaxy
 * Bowser Jr.'s Boom Bunker