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Sunspot   /sˈənspˌɑt/   Listen
Sunspot

noun
1.
A cooler darker spot appearing periodically on the sun's photosphere; associated with a strong magnetic field.  Synonym: macula.





WordNet 3.0 © 2010 Princeton University


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"Sunspot" Quotes from Famous Books



... experiment is constantly being performed for us in the sun. Every large sunspot contains a magnetic field covering many thousands of square miles, within which the spectrum lines of iron, manganese, chromium, titanium, vanadium, calcium, and other metallic vapors are so powerfully affected that their widening and splitting can be seen ...
— The New Heavens • George Ellery Hale


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