NASA - Solar Cycle sASbVkK-p0w

About

The number of sunspots increases and decreases over time in a regular, approximately 11-year cycle, called the sunspot cycle. The exact length of the cycle can vary. It has been as short as eight years and as long as fourteen, but the number of sunspots always increases over time, and then returns to low again.\r

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Human-made No record of this work says a model made it. What this means.

Archive

Wikimedia Commons, in Wikimedia Commons

Licence or status

Public domain, as the Wikimedia Commons states it.

Rights statement

Public domain

Credit

NASA Goddard

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