As National Park Week continues, we"re turning our attention to the vivid colors of the Grand Prismatic Spring in Yellowstone National Park. Its intense rainbow hues are formed by cycles of hot water rising, cooling, and falling—creating rings of distinct temperatures inside the spring. The clear, blue center is the hottest part, with almost nothing living in it. But the other rings are home to various microorganisms that produce bands of distinct colors ranging from green to orange to red.
Where do those colors come from?
Today in History
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Why, aloe there
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Happy Arbor Day!
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Atop the Needle of Chamonix
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Ringing in the new year at Teotihuacan
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Sand dunes in the Sahara, Algeria
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World Heritage Day
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Giving Tuesday
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Up on the glacier
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It’s NASA’s 60th birthday
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Gujō Hachiman Castle, Gifu prefecture, Japan
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Thomsons gazelles, Maasai Mara, Kenya
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Gamboa Crater, Mars
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World Meteorological Day
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Sligachan Old Bridge, Isle of Skye, Scotland
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World Reef Awareness Day
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A hint of spring
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Totally Thames Festival, London
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A winter light show
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Shakespeare Day
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Bear cubs roughhouse on Siblings Day
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Amur leopard cat, Russia
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Red-leaf hunting in Japan
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What s going on in this sky?
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National Library Week
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J.R.R. Tolkien Day
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Shakespeare Day
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A crested partridge
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World Environment Day
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African buffalo, Ngorongoro Crater, Tanzania
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Andermatt village in the Alps, Switzerland
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