What is at the end of Super Mario galaxy?

Answer 1

You battle the final boss, Bowser, of course. After you defeat him, he falls into his own lava planet, and it explodes soon then after. The Grand Star launches out of the planet, and Mario flies away with it. Bowser Jr. had thrown Peach out of the airship, so Mario catches her. Mario and Peach land safely on the beginning planet. Bowser can't believe that Mario had ruined his plans, and whines about his galaxy being destroyed right before it explodes. It explodes, and creates a black holes, which starts sucking everything into it. They Lumas, including Mario's Luma, sacrifice themselves by launching themselves into the black hole, therefore counteracting it. Mario's Luma waves goodbye before flying into the hole, which saddens Mario greatly. They woke up in the mushroom kingdom, where Peach and Bowser are seen looking into the sky. Mario looks up, and hears Rosalina talk. He sees a new galaxy out in the distance (one of the Lumas was reborn) and is seen shouting "Welcome! Welcome new galaxy!"

Answer 2

At the top of that stair way is the final level where u face off with bowser.

Answer 3

The Final Boss Fight. Bowser in The Sky.