From the Super Mario Wiki
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Dark Matter is an obstacle in Super Mario Galaxy, which appears in Bowser's Dark Matter Plant. It can be found in patches, and has a swirly, purple and black appearance to it; its appearance is similar to Poisoned Water. In the sequel, Super Mario Galaxy 2, it is found rarely in the game. One of its two appearances was the Daredevil Run for Bowser Jr.'s Boom Bunker and the other was Purple Pond Planet from the Cloudy Court Galaxy. A Mattermouth will eat the Dark Matter away.