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Binary Stars

Binary stars are actually a combination of little stars grouped together by their mutual gravitational attraction. Binary stars are also called double stars, even when there are three or more stars present.
In some binary-star systems, the stars periodically block each other as they orbit, making the total brightness seen from earth vary. These particular binary star systems are examples of eclipsing binaries.
One example of a binary star is Sirius. When viewed from earth, it is a bright bluish-white coloured star.
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