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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