When will halley's comet be visible from earth again?

Halley'a Comet passes by the Earth every 75-76 years. It last appeared in 1986 and therefore is not expected to return until around 2061. Theoretically, a person born in 1975 could see the comet twice in their life; once in '86 and again in 2061.

None   they are   equally likely to occur on any plate boundary

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