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Vardar

(Encyclopedia)Vardar värˈdär [key], river, c.240 mi (390 km) long, rising in the Šar Planina, North Macedonia, and flowing northeast then southeast in a fertile valley, past Skopje, through NE Greece to the Aeg...

Appalachian Mountains

(Encyclopedia)Appalachian Mountains ăpəlāˈchən, –chēən, –lăchˈ– [key], mountain system of E North America, extending in a broad belt c.1,600 mi (2,570 km) SW from the Gaspé Peninsula in Quebec prov....

Campbell, John Francis

(Encyclopedia)Campbell, John Francis, 1822–85, Scottish Gaelic scholar. He is known for Popular Tales of the West Highlands (4 vol., 1860–62) and Leabhar na Feinne (1872), a collection of Gaelic folk ballads. A...

radial velocity

(Encyclopedia)radial velocity, in astronomy, the speed with which a star moves toward or away from the sun. It is determined from the red or blue shift in the star's spectrum. ...

Cheyenne, river, United States

(Encyclopedia)Cheyenne, river, 527 mi (848 km) long, rising in E Wyo. and flowing NE to the Missouri River near Pierre, S.Dak. The Cheyenne basin is part of the Missouri River basin project. The U.S. Bureau of Recl...

Fen

(Encyclopedia)Fen fŭn [key], river, 375 mi (604 km) long, rising in the Wutai Mts. and flowing southwest, through a narrow valley, to the Huang He, Shanxi prov., N central China; navigable for small junks only in ...

Arno

(Encyclopedia)Arno, river, c.150 mi (240 km) long, rising in the Northern Apennines, Tuscany, central Italy, and flowing south to Arezzo where it turns northwest; it proceeds generally west, through Florence and Pi...

Hipparchus, Greek astronomer

(Encyclopedia)Hipparchus, fl. 2d cent. b.c., Greek astronomer, b. Nicaea, Bithynia. He is the first systematic astronomer of whom there are records. He made his observations chiefly on the island of Rhodes. Ptolemy...

Great Falls

(Encyclopedia)Great Falls, city (2020 pop. 60,442), seat of Cascade co., N central Mont., second largest city in the state, at the confluence of the Missouri and Sun ...

Webb Space Telescope

(Encyclopedia)Webb Space Telescope or James Webb Space Telescope (JWST), is an infrared space telescope, the largest in space at its launc...