Green Star

Green Power Stars are green-colored Power Stars that can be found in Super Mario Galaxy. Only three Green Power Stars are known to exist, all of which are hidden away in certain galaxies. Collecting all three of them will grant Mario access to the three Trial Galaxies; the Rolling Gizmo Galaxy, the Loopdeeswoop Galaxy, and the Bubble Blast Galaxy. Green Lumas will grow up to turn into Green Power Stars.

Green Power Star Locations

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

Trivia

 * 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.
 * Green Lumas grow up to become Green Power Stars, according to Rosalina.