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aeronomy
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Archaea at Midway Geyser Basin in the Grand Prismatic Spring, Yellowstone National Park, Wyoming. Largest hot spring in Yellowstone, third largest in the world. Temp. 147-188F Dim. 250x380 ft. Archaeon, archeon, Yellowstone Geysers, algae
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Lightning over the outskirts of Oradea, Rom., during the thunderstorm of August 17, 2005.
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Blackboard inscribed with scientific formulas and calculations in physics and mathematics
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Solar system illustration. (planets; sun)
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Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.
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Close up of books. Stack of books, pile of books, literature, reading. Homepage 2010, arts and entertainment, history and society
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An ancient egyptian hieroglyphic painted carving showing the falcon headed god Horus seated on a throne and holding a golden fly whisk. Before him are the Pharoah Seti and the goddess Isis. Interior wall of the temple to Osiris at Abydos, Egypt.
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Title: Senate Square, St. Petersburg, December 14, 1825: repression of the troop mutiny - watercolor by Carl Ivanovitch Kollman, 1825 depicts Decembrist uprising clashing with cavalry, with spectators watching. (new style December 26, 1825) Europe. Saint
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Woman tied to a ducking stool, a method of punishment by means of humiliation, beating, or death. (cucking stool)
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Rural Irish landscape, Sligo, Ireland.
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Diverse elementary school children wearing school uniforms running outside of school. Boys girls
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aeronomy

atmospheric science
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aeronomy, study of the physics and chemistry of the upper atmosphere, including the distribution of temperature, density, and chemical constituents, and the chemical reactions that occur. Studies of aurora, airglow, the ionosphere, Van Allen radiation belts, cosmic rays, and radiative and photochemical phenomena exemplify the diverse subjects that properly come under the heading of aeronomy.

This article was most recently revised and updated by John P. Rafferty.