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Sunspots: Optical View. Caption, Credits and Copyright
Sunspots, one manifestation of solar active regions, vary in number over time. When this image
was obtained the Sun displayed an unusually large number; the largest one visible is as big as the Earth.
Mount Wilson Observatory photograph
© California Institute of Technology
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Copyright © 1995: Board of Trustees, University of Illinois
NCSA. Last modified 11/10/95.