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noun, Astronomy.
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)
two stars, appearing close together when viewed through a telescope; either physically associated (binary star) or not associated (optical double star) See also binary star, optical double star
two stars that appear close together when viewed through a telescope but are not physically associated and are often separated by a great distance Compare binary star
double star
See binary star.


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