Callisto, 2,400 mi (4,800 km) in diameter, is the outermost and, apparently, the least geologically active of Jupiter's four major satellites. Its density is less than twice that of water.…
Composite volcanoes, sometimes called stratovolcanoes, are typically deep-sided, symmetrical cones of large dimension built of alternating layers of lava flows, volcanic ash, cinders, blocks…
Ganymede, 3,275 mi (5,270 km) in diameter, is Jupiter's largest moon, and it is also the largest satellite in the solar system. Ganymede is about one and one-half times the size of our Moon. It is…
The Martian MoonsMeteorites from Mars Mars, on the other side of Earth from Venus, is Venus's direct opposite in terms of physical properties. Its atmosphere is cold, thin, and transparent,…
(Encyclopedia) HyperionHyperionhīpērˈēən [key], in astronomy, one of the named moons, or natural satellites, of Saturn. Also known as Saturn VII (or S7), Hyperion is the largest highly irregular (…
(Encyclopedia) Lowndes, RawlinsLowndes, Rawlinsloundz [key], 1721–1800, president of South Carolina (1778–79), b. St. Kitts. In 1730 his family moved to Charleston, S.C., where Lowndes later became a…
(Encyclopedia) McConnell, Mitch (Addison Mitchell McConnell, Jr.), 1942–, U.S. politician, b. Tuscumbia, Ky., grad. Univ. of Louisville (B.A. 1964), Univ. of Kentucky Law School (J.D., 1967). A…
(Encyclopedia) Mayer, Louis Burt, 1885–1957, American movie producer, b. Russia. Mayer began (1907) as the operator of a theater in Haverhill, Mass., gradually gaining control of all the theaters in…
(Encyclopedia) Duval, William PopeDuval, William Poped&oomacr;vôlˈ, –vălˈ [key], 1784–1854, American frontiersman, territorial governor of Florida (1822–34), b. near Richmond, Va. He went to…
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