PREVIEW SUNSPOTS: Colleague Bob Zimmerman reminds that little is known and much less is understood of the 11 year trough to peak observed cycle of sunspots. More.

The John Batchelor Show - Een podcast door John Batchelor - Maandagen

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PREVIEW SUNSPOTS: Colleague Bob Zimmerman reminds that little is known and much less is understood of the 11 year trough to peak observed cycle of sunspots. More. 0CT0BER 1960

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