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supernova
(Encyclopedia)supernova, a massive star in the latter stages of stellar evolution that suddenly contracts and then explodes, increasing its energy output as much as a billionfold. Supernovas are the principal distr...shale
(Encyclopedia)shale, sedimentary rock formed by the consolidation of mud or clay, having the property of splitting into thin layers parallel to its bedding planes. Shale tends to be fissile, i.e., it tends to split...neutrino astronomy
(Encyclopedia)neutrino astronomy, study of stars by means of their emission of neutrinos, fundamental particles that result from nuclear reactions and are emitted by stars along with light. Approximately 100 billio...Alfonso III, king of Aragón and count of Barcelona
(Encyclopedia)Alfonso III, 1265–91, king of Aragón and count of Barcelona (1285–91), son and successor of Peter III. He was forced to grant wide privileges to the cortes of the Aragonese nobles. At first he su...Alfonso IV, king of Aragón and count of Barcelona
(Encyclopedia)Alfonso IV, 1299–1336, king of Aragón and count of Barcelona (1327–36), son and successor of James II. Before his accession he conquered (1323–24) Sardinia, where later a revolt involved him in...Frederick III, emperor of Germany and king of Prussia
(Encyclopedia)Frederick III, 1831–88, emperor of Germany and king of Prussia (Mar.–June, 1888), son and successor of William I. In 1858 he married Victoria, the princess royal of England, who exerted considerab...American Federation of Labor and Congress of Industrial Organizations
(Encyclopedia)American Federation of Labor and Congress of Industrial Organizations (AFL-CIO), a federation of autonomous labor unions in the United States, Canada, Mexico, Panama, and U.S. dependencies, formed in ...James I, king of Aragón and count of Barcelona
(Encyclopedia)James I (James the Conqueror), 1208–76, king of Aragón and count of Barcelona (1213–76), son and successor of Peter II. After a minority was disturbed by private wars among the nobles, James soon...James II, king of Aragón and count of Barcelona
(Encyclopedia)James II, c.1260–1327, king of Aragón and count of Barcelona (1291–1327), king of Sicily (1285–95). He succeeded his father, Peter III, in Sicily and his brother, Alfonso III, in Aragón. James...John I, king of Aragón and count of Barcelona
(Encyclopedia)John I, 1350–95, king of Aragón and count of Barcelona (1387–95), son and successor of Peter IV. During his reign Aragón lost (1388) the duchy of Athens. An enthusiastic patron of learning and a...Browse by Subject
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