Bowser Jr.'s Lava Reactor

"If I give up any more Grand Stars, my dad's gonna get MAAAAAAD! So this calls for my ultimate weapon! Give 'em some heat, King Kaliente!"

- Bowser Jr.

Bowser Jr.'s Lava Reactor is a Bowser Jr. galaxy in Super Mario Galaxy. This is where Mario battles King Kaliente for the second time and receives a Grand Star. The galaxy is an extremely large planet made out of lava with very few rocks.

Planets/Areas
NOTE: Unless otherwise noted, all names are unofficial.

Starting Planet
This is a small planetoid that is made of dirt and is half-gone, apparently being slowly consumed by the black hole within it. There are several Goombas and one Bullet Bill launcher. There are also several cages that can be broken by a Bullet Bill that contain items such as coins, a 1-Up Mushroom and a Launch Star. This planetoid can be considered a moon because it appears to orbit the much larger Lava Reactor.

Lava Reactor
The Lava Reactor is a large star-like entity made up solely of lava. There are several sinking platforms around its northernmost region in a circle formation, with more sinking platforms in a path-like formation across its southernmost region. This planet is home to King Kaliente and is where Mario fights him for the second time.

Mission
This galaxy contains only the following mission.

Trivia

 * There is a glitch in this galaxy where one can triple jump onto the cage with the 1-Up Mushroom on the Starting Planet and Star Spin at the height of the jump to actually fall on to the Lava Planet, similar the one in Bowser Jr.'s Robot Reactor; However, unlike the latter when the player lands on the solid planet where Megaleg was, since Mario or Luigi will fall nowhere near where the launch star would take him, the player has no choice but to lose a life by bouncing on the lava.