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Sunspots
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Look like flecks of dirt
in on the picture
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Caused by cool spots in photosphere
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recall cooler blackbodies
emit less light
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Galileo observed sunspots
and the rotation of the sun
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Sun rotates every ~4 weeks
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Equator rotates faster than
poles!
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Number of sunspots varies
on an 11 year cycle
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Even though sunspots are
cooler, the sun as a whole is more active when there are more sunspots
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Number of sunspots may effect
the weather!
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