Green Star

Green Power Stars are green Power Stars that can be found in Super Mario Galaxy. Only three Green Power Stars exist, each of which are hidden away in a galaxy. Collecting all three of them grants Mario access to the three Trial Galaxies: the Rolling Gizmo Galaxy, the Loopdeeswoop Galaxy, and the Bubble Blast Galaxy.

The Green Power stars are located in:
 * Buoy Base Galaxy, The Secret of Buoy Base - Under the Buoy Base sealed in a cage.
 * Dusty Dune Galaxy, Treasure of the Pyramid - Collecting 5 Silver Stars in the Pyramid Planet.
 * Battlerock Galaxy, Luigi under the Saucer - Saving Luigi under the 1st Power Star.

Trivia

 * Rosalina explains that Green Lumas grow up to become Green Power Stars.
 * Even though only three Green Power Stars are recovered in the game, a total of seven Green Lumas can be found on the Comet Observatory and the Planet of Trials.