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Halley's comet

a famous comet, last seen in 1986, whose reappearance about every 76 years was predicted by Edmond Halley

See Halley's comet in American Heritage Dictionary 4

noun

A comet with a period of approximately 76 years. The first comet for which a return was successfully predicted, it last appeared in 1986.

Origin:

Origin: After Edmund Halley

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Halley's comet science

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