1
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there must be something in a sunspot

2
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that opens up a wealth of knowledge and

3
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even more questions like Galileo before

4
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him german astronomer Samuel Heinrich

5
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Schwab became fascinated with sunspots

6
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from careful observation over 17 years

7
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Schwab found a periodic cycling of the

8
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average number of sunspots in the mid

9
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1800s he and other astronomers found

10
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that the Sun has about an 11-year cycle

11
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between the times when we can observe

12
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the most and the least sunspots

13
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understanding the 11-year solar cycle

14
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becomes very crucial in understanding

15
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the effects of space weather here at

16
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Earth because it really dictates how