which star and his companions move around each other because of their comparable masses
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Stars in binary systems (two stars orbiting each other) can exchange mass. One of the stars (the donor) expands enough that some of its mass falls onto its companion (the acceptor). At this point, one of several things can happen. If the mass is transferred too fast, the acceptor star will not be able to accept it all, and some of the mass will form a cloud around both stars. Friction with this cloud will cause the stars to fall in toward each other, and the cloud will be kicked off into space.
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