optical double

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English

Etymology

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Pronunciation

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Noun

optical double noun

A star that appears as a double due to an optical illusion; in reality, the stars may be far apart from each other.

Verb

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Synonyms

double star visual binary optical axis forced perspective limb darkening aberration of light gravitational mirage olbers' paradox field star penrose triangle stardrift aberration fixed star tribar troxler effect binary system

Usage & collocations

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