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wood prints space wood prints sun wood prints star wood prints sunspot wood prints history wood prints astronomy wood prints astrophysics wood prints solar astronomy wood prints solar physics wood prints illustration wood prints monochrome wood prints black-and-white wood prints circle wood prints round wood prints 17th century wood prints

photographs space photos sun photos star photos sunspot photos history photos astronomy photos astrophysics photos solar astronomy photos solar physics photos illustration photos monochrome photos black-and-white photos circle photos round photos 17th century photos

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Galileo's sunspot observations. The Italian astronomer Galileo Galilei (1564-1642) was one of the first people to observe sunspots, using his telescope to do so in 1612. The following year, he published his observations in Istoria e Dimostrazioni Intorno Alle Macchie Solari e Loro Accidenti (History and Demonstrations Concerning Sunspots and their Properties). In this diagram, the sunspots (dark areas) are labelled C, R, and M. Sunspots are areas of magnetic activity that are cooler than the rest of the Sun's surface.

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