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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 poison. In the sequel, Super Mario Galaxy 2, it is found rarely in the game, appearing in the missions "Boomsday Machine Daredevil Run" in Bowser Jr.'s Boom Bunker and "Silver Stars in the Purple Pond" in the Cloudy Court Galaxy.