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dou'ble star'

two stars that appear as one if not viewed through a telescope with adequate magnification, such as two stars that are separated by a great distance but are nearly in line with each other and an observer (optical double star), or those that are relatively close together and comprise a single physical system (physical double star). Cf. binary star.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

double standarddouble steal
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