Two stars that are in the same line of sight as seen from the earth, but that may be at far different distances. See also double star.
- At first he figured that such pairs consisted of two stars vastly distant from each other but coincidentally lying along a single line of sight - a visual phenomenon we now call optical doubles.
- The physical doubles (or binary stars) are much more numerous than the optical doubles.
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Syllabification: op·ti·cal dou·ble
Definition of optical double in:
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