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comet British & World English

A celestial object consisting of a nucleus of ice and dust and, when near the sun, a ‘tail’ of gas and dust particles pointing away from the sun

Halley's comet British & World English

A periodical comet with an orbital period of about 76 years, its reappearance in 1758-9 having been predicted by Edmond Halley. It was first recorded in 240 bc and last appeared, rather faintly, in 1985-6

Halley's Comet in Halley New Oxford Dictionary for Writers & Editors

, Edmond (1656–1742), English astronomer, who identified Halley's Comet;

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