Sun and sunspots in 1910s, stereoscopic card

Sun and sunspots in 1910s, stereoscopic card

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Caption: Sun and sunspots in 1910s, stereoscopic card. These are paired stereoscopic images which provide a 3D image (stereogram) when viewed side-by-side. Sunspots (dark areas) are areas of magnetic activity that are cooler than the rest of the Sun's surface. Image obtained with the 40-inch refracting telescope at the Yerkes Observatory, Chicago, USA. Published by the Keystone View Company.

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Keywords: 1900s, 1910s, 2, 20th century, 3d imaging, astronomical, astronomy, astrophysical, astrophysics, black-and-white, duo, historical, history, image pair, keystone view company, monochrome, no-one, nobody, paired, solar, solar astronomy, solar physics, solar system, space, stereogram, stereoscopic card, stereoscopy, sun, sunspot, sunspots, two, yerkes observatory

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