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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.