A binary star is a
stellar system consisting of two
stars orbiting around their
center of mass. For each star, the other is its companion star. Recent research suggests that a large percentage of stars are part of systems with at least two stars. Binary star systems are very important in
astrophysics, because observing their mutual orbits allows their
mass to be determined. The masses of many single stars can then be determined by extrapolations made from the observation of binaries.
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