Fountain
The Fountain is a Dome in Super Mario Galaxy. It is the second accessible Dome. The exterior is made of white stones and has water spouting from the sides. The interior has blue tiles and water running through it like channels. Princess Rosalina describes the Dome as being very relaxing. As with all Domes,
the Fountain has a Pull Star in the center which is used to access its Galaxies.
Galaxies and what you learn in them
The Terrace Dome was still a little tutorial but here you must finally cross some harder galaxies, however there still is no real challenge. At Battlerock Galaxy you still learn some things, such as Bob-Omb throwing. The first level in Battlerock is also a little gravity training. In Space Junk Galaxy you learn how to move from Pull Star to Pull Star. In this Dome you will also fight many boss battles: Kamella, Tarantox, Topmaniac and Bowser Jr. are some of them. The rest of the levels, you must use the abilities you learned. Practice a lot, cause you won't get help in the following domes.