Loopdeeloop Galaxy

The Loopdeeloop Galaxy is a galaxy in Super Mario Galaxy, and is located within the Terrace. It is a ? Block before it is unlocked. It will be unlocked after five Stars are collected. This galaxy is basically a long flow of water across the sky where Mario plays Manta Ray Surfing. It is inhabited by Penguins, most of whom cheer Mario on from the sidelines. This galaxy doesn't have any enemies at all.

Loopdeeloop Planet
This Planet starts with Mario landing on an area with the Penguins and Coach. If the player chooses to take the training course, then they will go to an area with many where they swim on a Manta Ray, and it contains many coins, Star Bits, and some islands. After the training course, Mario will go to the real area, where this time it is possible to fall into a black hole. This watery race track has fish swimming in the water, flags on the side of it, and rings over the track. There are some Penguins that cheer Mario on during the race. This area has more waves, so the Manta Ray will hop in the water. This Planet has coins and some 1-Up Mushrooms to collect. Near the end, there are waves that will make the Manta Ray jump very high over the water. If Mario manages to survive the race track, then the Coach will give the player a Power Star.

Surfing 101
Surfing 101 is the only level in this Galaxy, which Mario rides a Manta named Ray along the Loopdeeloop Galaxy to earn a Power Star. The course contains a 1-Up Mushroom in addition to a handful of Gold Coins. The player does not need to beat the best time, just survive the course. This level appears to be analogous to Blooper Surfing Safari in Super Mario Sunshine, in which Mario rides a Blooper in Ricco Harbor.

Trivia

 * Although this galaxy's name comes from the term "loop-de-loop", there are no loops in this course. There is a loop, however, in Loopdeeswoop Galaxy.