A star that varies in brightness over a period of time that may be hours, days, weeks or even years. The variation can be due to many reasons such as ejecting shells or gas and dust blocking the light of the star or eclipsing processes.

Famous variable star Algol (Dept. of Physics and Astronomy - Univ. of Tennessee at Knoxville)

Glossary A B C D E F G H I J K L M N O P Q R S T U V W X Y Z


Sky Highlights - April 2017

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Current Moon Phase

CURRENT MOON

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