Binary Star Systems

How common are binary stars and multiple stars?

In the part of the Milky Way galaxy where the Sun resides, at least half of the stars have been shown to be in binary and multiple star systems. The actual fraction of stars that are binary or multiple is not exactly known, and this is still a subject of frontier scientific research. Certainly, the fraction is high enough that it is an important factor to take into account when astronomers study stellar birth and life cycles.


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