The Dreadnought Galaxy is a galaxy in Super Mario Galaxy.
Missions
Infiltrating the Dreadnought
In this mission, Mario first lands on the laser planet. Mario must go through a tricky obstacle course to find the Power Star.
Dreadnought's Colossal Cannons
Mario has to go through another obstacle course, but this course involves dodging many cannons
Revenge of the Topman Tribe
Mario must battle Topman again
Topman Tribe Speed Run (Speedy Comet in Orbit)
This mission is only accessible, unless already completed, if a Speedy Comet is in orbit.
Battlestation's Purple Coins (Purple Comet in Orbit)
This mission is a Purple Coin mission. It is only accessible, unless already completed, if a Purple Comet is in orbit.
Dreadnought's Garbage Dump
This is a hidden star in the Topman level. Again, you have to blow up garbage, but this time the challenge is harder.