World 4 (Super Mario Galaxy 2)

World 4: The Many Mysteries of the Cosmos is the fourth world featured in Super Mario Galaxy 2. It is located near a spiral galaxy. It holds seven galaxies, the last of which, Bowser's Gravity Gauntlet, features the second encounter with Giant Bowser, who again attacks Mario on a small planet, though now with several new moves.

Galaxies

 * Supermassive Galaxy
 * Flipsville Galaxy
 * Starshine Beach Galaxy
 * Chompworks Galaxy
 * Sweet Mystery Galaxy (Hungry Luma)
 * Honeyhop Galaxy
 * Bowser's Gravity Gauntlet