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 in a galaxy cluster. It holds seven galaxies, the last of which, Bowser Jr.'s Boom Bunker, features the third and last encounter with Bowser Jr., who now attacks with his Boomsday Machine.

Galaxies

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