Sky Station Galaxy

Sky Station Galaxy is a galaxy confirmed to make an appearance in Super Mario Galaxy 2. The level begins with Mario flying through a series of clouds, eventually landing on a disc-shaped planetoid. The player can see Yoshi's House nearby, but he's not there. A Luma appears and tells Mario that the Power Stars have been stolen by a monster. The level is the introductory stage of the game, taking place before Mario lands on Starship Mario, according to the Japanese official website. The galaxy introduces the player to the gravity based gameplay and spherical planets of Super Mario Galaxy 2.

Yoshi House Planet
This is the starting planet for most missions in this galaxy. It is round and flat and divided into halves. The top half is grassy and Yoshi's House resides on it. The top half also contains two warp pipes, one green and one red. They both lead to the underside, but the red one transports you to inside a cage with a 1-Up Mushroom inside. A hole in the middle of the planet can transport you to the other side. A fence lines the planet's perimteter. A Tip Network which shows you how to star spin to defeat enemies is also seen on the underside of the planet. Enemies here include Goombas.

Grass Planet
This is a semi-large, grassy planet, which is home to many Octoombas. It is slightly rounded and it has a ? Coin, a Checkpoint Flag and a warp pad. Yellow platforms which rise then turn blue and disappear are seen here and help you traverse the planet.

Bonus Planet
This planet looks like other bonus planets. Several Octoombas inhabit this planet and if you defeat all of them using the Rainbow Star within the time limit, a 1-Up Mushroom will appear.

Geo Planet
This planet is almost identical to the planet on which you fought Dino Piranha on in the predecessor of Super Mario Galaxy 2. Peewee Piranha is fought on this planet.

Sky Fleet Ship
The Sky Fleet Ship appears in the second mission and it is a cylindrical, transparent planet with in inside with platforms, similar to the Pill Planet in the first game. The ship has a conical nose with a propellor at the tip. Banzai Bill Blasters launch Banzai Bills toward Mario or Luigi as they travel across the planet's glassy outside. A Rainbow Star is on the surface of the ship. Inside, there is platforming to be done and there is a warp pad and Launch Star inside.