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after how many days does the halley's comet can be seen?
Halley's Comet or Comet Halley,is the best-known of the short-period comets and is visible from Earth every 75–76 years. Halley is the only short-period comet that is clearly visible to the naked eye from Earth, and thus the only naked-eye comet that might appear twice in a human lifetime.Other naked-eye comets may be brighter and more spectacular, but will appear only once in thousands of years.


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