There is currently no Super Mario Galaxy 3. If you mean Super Mario Galaxy 2 there are 242 stars.
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Although there are 150 stars in total, you only need 80 stars (and Mario) to complete the game as this is the number of stars you need to get into the final Bowser level.
5
There are 4, Super Mario Bros. 1, Super Mario Bros. 2 and Super Mario Bros. 3, there is also Super Mario Bros. The Lost Levels which is the original Super Mario Bros. 2 in Japan. They have also made a remake of Super Mario All-Stars for Nintendo Wii.
Rosetta is from the wii game super Mario galaxy where she looks after the stars in the observetry. Rosetta is from the wii game super Mario galaxy where she looks after the stars in the observetry.
When you get 120 stars you see a green comet and scatters 120 green stars