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staedtler staedtler
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20.   The Maunder Minimum is a period of time

(a)   in the 1600’s when sunspots were absent from the Sun.
(b)   between times of maximum sunspot numbers in every solar sunspot cycle.
(c)   when the Sun’s radius is at a minimum during its slow oscillation in size.
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Discovering the Universe

Discovering the Universe


Edition: 7th
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papachulopapachulo
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