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The appearance of Halleys Comet once every 76 years is a periodic change. |
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Answer» Halley's Comet is arguably the most FAMOUS comet. It is a "periodic" comet and returns to Earth's vicinity about every 75 years, making it possible for a HUMAN to SEE it twice in his or her lifetime. The last time it was here was in 1986, and it is projected to RETURN in 2061. |
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