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+A **variable star** is a star whose [luminosity](/wiki/Luminosity) fluctuates, appearing to change brightness over time. These celestial objects exhibit variations due to internal physical processes like [pulsation](/wiki/Pulsation) or eruptions, or external factors such as eclipses by a companion.
+## See also
+- [Star](/wiki/Star)
+- [Binary Star](/wiki/Binary_Star)
+- [Astronomy](/wiki/Astronomy)
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