From the Super Mario Wiki
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The Beacon is a large star-like reactor that powers the Comet Observatory, including the space station's propulsion systems, life support, and its Domes. The Beacon begins as a small, dim star, but as Mario collects more Grand Stars, the star becomes larger and brighter, allowing access to more Domes. The Lumas need the beacon to survive. Through the course of the game, it changes colors from burgundy (No Grand Stars) to orange (1 Grand Star), then yellow (2 Grand Stars), green (3 Grand Stars), greenish-blue (4 Grand Stars), blue (5 Grand Stars), and finally turquoise (6 Grand Stars). There is also an invisible wall that prevents the player from touching the Beacon.
In Super Mario Galaxy 2, Starship Mario has, in its engine room, what appears to be a miniature beacon that runs on Power Stars. This miniature beacon is the energy source for the starship. It is additionally only colored turquoise for the entire game.
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