Super Mario Galaxy/Bowser's Galaxy Reactor

Bowser's Galaxy Reactor is accessible from the Garden observation dome.

Star 1: The Fate of the Universe
This is it! the final level,well its not[there are 120 stars,this is the 60th star,so when you reach 120,you have to play this level again].The first part is a castle wall with spotlights on them,stay on the spotlights without losing it,the next part is a fire planet from Freezeflame Galaxy,the 3rd part has ice blocks that make a path from the Space Junk Galaxy,the 4th part is a sand planet from the Dusty Dune Galaxy.The 5th part has ice blocks like the 3rd planet,but this time they disappear after a few seconds.The 6th part has a Fire ring planet from the Melty Molten Galaxy.There are Bowser Statues,Bullet Bills,and Banzai Bills,dodge them all to reach a Launch Star,to the planet near the Sun.Bowser Jr. has Princess Peach behind him on his airship.Bowser is also here.You will battle Bowser on 3 different Planets while Bowser Jr. watches them fight from his airship.on the 1st planet,Bowser will turn into a boulder and roll at you,make a green plant hit him in the face.On the 2nd Planet closer to the Sun,Bowser will roll using 2 of his shells.You can't spin him.Make a green plant hit him.On the 3rd planet,it is inside the Sun!,Burn his tail by luring Bowser to ground pound the glass of Star energy 3,then spin his tail 3 times to make him fall off the gravitational pull and into the Sun.The Ending:Mario flies Princess Peach after receiving the last Grand Star back to his starting position,the spotlights are gone,then something mysterious happened,the Sun is sucking rocks,Bowser is on one of them,then the Sun near his Galaxy Reactor turned into a huge black hole sucking in Mario,Peach,and the Comet Observatory.Then one of Mario's Lumas waved and zoomed into the black hole reversing the gravity.Mario,Peach,and Bowser all end up at Princess Peach's castle.Then the Purple Comet is unlocked which has Purple Coins[100 of them give you a star].Enjoy your Other Half Quest.