Sunspots on the surface of the sun,October 27th,2003. Sunspots are regions of the suns photosphere that are substantially cooler than the surrounding area. Their frequency fluctuates on an eleven year cycle,its cause as yet unknown | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Chumack, John |
Bildgröße: | 2045 px × 2028 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
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