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With a period of 76 years, Halley's Comet appears in many historical contexts.
It is an educational content of CK-12 Foundation (to access some of the CK-12 contents you must be logged in).
Hipervinculo Ciencias de la Tierra y Medioambiente
Describes the characteristics of comets.
It is an educational content of CK-12 Foundation (to access some of the CK-12 contents you must be logged in).
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