One of the mysteries of the English language finally explained.
A group of two stars which appear to constitute a double star due to their being in the same line of sight as seen from the earth, but are actually at different distances.
- ‘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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