Where do you find the three green stars in super Mario galaxy?

Answer 1

First in the Buoy Base galaxy, instead of climbing to the top, dive down, use a torpedo ted, uncase the warp pipe, and go down. Free the green star by firing a bullet bill to its casing.

Next in the Dusty Dune galaxy, start the mission "Blasting Through the Sand". The player must traverse the level until they reach the platform near the Boulders, then feed a Hungry Luma twenty Star Bits to create a Launch Star leading to the bottom of the planet. Once the player is inside the planet, Mario has to collect five Silver Stars in order to get the Green Power Star.

Finally in the Battlerock galaxy, start the mission "Battlerock Barrage".

This Power Star is only accessible at first when Luigi sends Mario a letter with a picture of the Battlerock Galaxy. When Mario reaches the platform which normally holds the Power Star, it will not be there. The player needs to walk underneath the platform to discover a cage that is holding Luigi. Mario will have to lure a Bullet Bill over to this cage to free him, and he will give Mario a Green Power Star.