They allow you to travel to the "trial galaxies"- three challenging hidden galaxies that each have 1 power star-when you gather all 3.
The first can be found in battlerock galaxy, when luigi gives you an email saying he is trapped. The second can be found in dust dunes galaxy. The third is in bouy base galaxy. I wish I knew where they were but I'm to specific, i coukldnt tell.
there red
Bowser
120.
122 power stars and 120 green stars.
You don't! There are no red stars on Super Mario Galaxy 2
There is currently no Super Mario Galaxy 3. If you mean Super Mario Galaxy 2 there are 242 stars.
Super Mario Galaxy 2 has 242 stars in the game, just like the prequel. However, the green stars only appear after you get 120 stars.Green stars appear in every galaxy (except Grandmaster Galaxy). Usually there are 2-3 green stars in a galaxy. Now the objective is to find the hidden stars in the galaxy, which can prove quite challenging.After getting all the green stars, you end up with 240 stars, which will unlock the final galaxy: the aforementioned Grandmaster Galaxy. There are 2 stars in the galaxy, which will bring the total to a satisfying 242.So in summary, you can only get the green stars after having 120 stars.I hope that helped!- Ryanthelion
yes there is you might need help from a friend and walkthroughs/cheats.
To get green stars, you go through each level and look for green stars. You can also listen for the star "sound."
120 Green Stars 120 Power Stars 49 Comet Medals Got the game yesterday. Its awesome and EPIC! (Get all these for the Grandmaster Galaxy) source from : Super Mario Galaxy 2 Game Guide by PRIMA Games and Nintendo
power stars
6 stars