Mario talks to Luigi on the Garage.

The Garage is an area on the Comet Observatory in Super Mario Galaxy. It serves as the docking area for small spacecraft, mostly the Starshroom. When Mario first accesses the Comet Observatory, the Garage will be empty, however, it soon will become occupied by the Toad Brigade and and several Lumas, which build a red Starshroom for them here. The Toad Brigade will appear here after collecting the first Power Star in the Honeyhive Galaxy. Once Luigi is rescued from the Ghostly Galaxy, he will appear here as well and will remain here until he gets lost again in other galaxies. Besides the Starshroom that appears here over time, there is a Warp Pad here that can be used via the Warp Pad on the top-most part of the Comet Observatory (possibly the Garden) first, then to and from there, as well as a Crate that can always be Spun to reveal a 1-Up Mushroom. This is one of the few places that a 1-Up Mushroom can be found on the Comet Observatory. 

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