World 1 (Super Mario Galaxy 2)

World 1: The Great Space Journey Begins is the first world featured in Super Mario Galaxy 2. It holds seven galaxies, the last of which, Bowser Jr.'s Fiery Flotilla, features the first encounter with Bowser Jr., who attacks using Gobblegut.

Galaxies

 * Sky Station Galaxy
 * Yoshi Star Galaxy
 * Spin-Dig Galaxy
 * Fluffy Bluff Galaxy
 * Flip-Swap Galaxy
 * Rightside Down Galaxy
 * Bowser Jr.'s Fiery Flotilla

Music
The music that plays on the World 1 map is initially the same as the music for World 2. However, after green Prankster Comets begin appearing, the music becomes a quiet rendition of the theme of Good Egg Galaxy.