CN+Milestone+Map+-+Explain+why+a+star+might+be+variable.

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= = =Explain why a star might be variable.=

Variable Stars are stars that vary in their light output. Their magnitudes change over a period of time, causing the star to become bright and then become faint. It keeps repeating the process of becoming brighter and then decreasing its brightness and becoming faint.

References: http://www.aavso.org/vstar/types.shtml