zurückweiter Sunspots are dark spots on the visible surface of the Sun (photosphere) that are cooler and therefore emit less visible light than the rest of the surface. Their number and size is the simplest measure of solar activity.Sonnenaufgangsfahrt Add new comment You must have JavaScript enabled to use this form. Your name Email The content of this field is kept private and will not be shown publicly. Homepage Betreff CommentAbout text formatsSave zurückweiter
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