From the Super Mario Wiki, the Mario encyclopedia
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Super Mario Galaxy
Sentry Beams debut in Super Mario Galaxy, first appearing in the Battlerock Galaxy. They also appear in Bowser Jr.'s Airship Armada and the Toy Time Galaxy. Sentry Beams are stationary robots that hover in place, firing a laser at Mario if he approaches them. They cannot be destroyed by any means, but if Mario stands on top of them, they cease all motion until he gets off and starts to move again.
Super Mario Galaxy 2
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