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Variable star

A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates. A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.

[ "Photometry (optics)", "Stars", "Delta Cephei", "Classical Cepheid variable", "Long-period variable star", "General Catalogue of Variable Stars", "Type II Cepheid" ]
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