Are made of two stars that are genuinelyclose to each other and bound together
by mutual gravitational attraction.
The two stars orbit around a common center of mass.
For each star, the other is its companion star.
The components of binary star systems
can exchange mass, bringing their
evolution to stages that single stars cannot attain.
Hubble image of the Sirius binary system, in which
Sirius B can be clearly distinguished (lower left).
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