| Sunspots |
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| Darker and
cooler areas on the Sun are caused by strong |
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| magnetic
fields. They last from several
hours to several months. |
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| The number of
spots you can see goes up and down with the rise |
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| and fall of the solar
cycle (11 years). |
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| Light and
dark in this |
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| magnetic
scan of the Sun |
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| indicate
concentrated |
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| areas of
intense |
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| magnetic field. |
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| Close-up |
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| of sunspot |
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