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photosphere
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Photosphere
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Visible surface of the Sun, which emits light and heat. About 300 km/200 mi deep, it consists of incandescent gas at a temperature of 5,800 K (5,530°C/9,980°F).
Rising cells of hot gas produce a mottling of the photosphere known as granulation, each granule being about 1,000 km/620 mi in diameter. The photosphere is often marked by large, dark patches called sunspots.
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