Halley's Comet - Alchetron, The Free Social Encyclopedia
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Halley's Comet - Alchetron, The Free Social Encyclopedia
Halley's Comet or Comet Halley, officially designated 1PHalley, is a shortperiod comet visible from Earth every 7576 years. Halley is the only known shortperiod comet that is regularly visible to the naked eye from Earth, and the only nakedeye comet that might appear twice in a human lifetime.
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