Bowser Jr.'s Fiery Flotilla

Bowser Jr.'s Fiery Flotilla is a galaxy confirmed to make an appearance in Super Mario Galaxy 2. Not much is known about this galaxy so far, but Mario is seen fighting a new boss in the game, Gobblegut, in the galaxy. It is possible that Bowser Jr. summoned Gobblegut to defeat Mario, since Bowser Jr. owns the galaxy. Also there are Airships in the background so that is also proof.