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The beacon, with its power having been partially restored
“That ball of flame represents the power of the observatory. We call it the beacon. When you recover a Grand Star, a little Star Power will be restored, and the beacon will grow.”
Rosalina, Super Mario Galaxy

The beacon is a large star-like reactor that powers the Comet Observatory, including the space station's propulsion systems, its life support, and its domes, introduced in Super Mario Galaxy. 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 (one Grand Star), then yellow (two Grand Stars), green (three Grand Stars), sea green (four Grand Stars), blue (five Grand Stars), and finally turquoise (six 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 colored only turquoise for the entire game.

In Mario + Rabbids Sparks of Hope, while the Comet Observatory is under Cursa's control as part of its stronghold, the beacon becomes the source of all Darkmess spreading across the galaxy, and also serves as the entrance to the core of the Darkmess Dimension where Cursa resides.


Additional names[edit]

Internal names[edit]

Game File Name Meaning

Super Mario Galaxy ObjectData/AstroCore.arc AstroCore Astro Core
Super Mario Galaxy StageData/ObjNameTable.arc/ObjNameTable.tbl 天文台コア (Tenmondai Koa) Observatory Core

Names in other languages[edit]

Language Name Meaning
Japanese トーチ
French (NOA) Balise Beacon
French (NOE) Brasier Center
German Kraftfeld Force field
Italian Braciere Brazier
Korean 토치가
Spanish Faro Beacon


  • The Grand Stars' effects on the beacon seem to resemble the way the flames of a real-life star change color and size as it "ages" and burns. However, there are no real-life stars with a green hue—instead, as they get heavier, stars turn from yellow to white, then blue.
    • The final color of the beacon is also similar to what was once mistakenly reported as the average color of the universe, before the corrected color of cosmic latte was determined. Baby Luma is similar in color to cosmic latte.