Red Power Star

The Red Power Star is a special Power Star that appears only once in Super Mario Galaxy, and is absent in Super Mario Galaxy 2 along with every other Mario game.

This specific power star can be found in the Gateway Galaxy, in the second star of the galaxy, Gateway's Purple Coins. The red star is presented to you by a Red Luma after you have collected the 100 Coins.

The Red Power Star functions as a regular Power Star, apart from the fact that it unlocks the Red Star, which can be used in the Comet Observatory.