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nucleosynthesis
(Encyclopedia)nucleosynthesis or nucleogenesis, in astronomy, production of all the chemical elements from the simplest element, hydrogen, by thermonuclear reactions within stars, supernovas, and in the big bang at...chromosphere
(Encyclopedia)chromosphere krōˈməsfērˌ [key] [Gr.,=color sphere], layer of rarefied, transparent gases in the solar atmosphere; it measures 6,000 mi (9,700 km) in thickness and lies between the photosphere (th...helium
(Encyclopedia)helium hēˈlēəm [key], gaseous chemical element; symbol He; at. no. 2; at. wt. 4.0026; m.p. below −272℃ at 26 atmospheres pressure; b.p. −268.934℃ at 1 atmosphere pressure; density 0.1785 g...Jupiter, in astronomy
(Encyclopedia)Jupiter jo͞oˈpətər [key], in astronomy, 5th planet from the sun and largest planet of the solar system. Astronomers have discovered 79 satellites orbiting Jupiter, but five of those, small sate...nonsporting dog
(Encyclopedia)nonsporting dog, classification used by breeders and kennel clubs to designate dogs that may formerly have been bred to hunt or work but that are now raised chiefly as house pets and companions. The f...eukaryote
(Encyclopedia)eukaryote yo͞okârˈē-ōtˌ [key], a cell or organism composed of cells that have a membrane-bound nucleus and organelles (mitochondria, chloroplasts; see cell, in biology) and genetic material orga...Lavoisier, Antoine Laurent
(Encyclopedia)Lavoisier, Antoine Laurent äNtwänˈ lōräNˈ lävwäzyāˈ [key], 1743–94, French chemist and physicist, a founder of modern chemistry. He studied under eminent men of his day, won early recognit...Dravidian languages
(Encyclopedia)Dravidian languages drəvĭdˈēən [key], family of about 23 languages that appears to be unrelated to any other known language family. The Dravidian languages are spoken by more than 200 million peo...Cuvier, Georges Léopold Chrétien Frédéric Dagobert, Baron
(Encyclopedia)Cuvier, Georges Léopold Chrétien Frédéric Dagobert, Baron zhôrzh lāôpôldˈ krātyăNˈ frādārēkˈ dägôbĕrˈ bärôNˈ küvyāˈ [key], 1769–1832, French naturalist, b. Montbéliard, st...Siebold
(Encyclopedia)Siebold tāˈōdōr ĕrnst [key], 1804–85, also a physician, was one of the foremost biologists of his time. He specialized in the comparative anatomy of invertebrates and wrote the first volume (18...Browse by Subject
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