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Bailly, Jean Sylvain

(Encyclopedia)Bailly, Jean Sylvain zhäN sēlvăNˈ bäyēˈ [key], 1736–93, French astronomer and politician. His works on astronomy and on the history of science (notably the Essai sur la théorie des satellite...

Laplace, Pierre Simon, marquis de

(Encyclopedia)Laplace, Pierre Simon, marquis de pyĕr sēmôNˈ märkēˈ də läpläsˈ [key], 1749–1827, French astronomer and mathematician. At 18 he went to Paris, proved his gift for mathematical analysis to...

rocket, in aeronautics

(Encyclopedia)CE5 Relative positions of the components of the Saturn V rocket, the U.S. space vehicle used in the moon missions rocket, any vehicle propelled by ejection of the gases produced by combustion of s...

In

(Encyclopedia)In, symbol for the element indium. ...

Jove

(Encyclopedia)Jove: see Jupiter, in Roman religion and mythology. ...

ion, in chemistry

(Encyclopedia)ion, atom or group of atoms having a net electric charge. Ionization has many applications. Vapor lamps and fluorescent lamps take advantage of the light given off when positive ions recombine with ...

Kirkwood gaps

(Encyclopedia)Kirkwood gaps, regions in the asteroid belt within which few asteroids are found. Astronomer Daniel Kirkwood first observed (1886) that few asteroids had an orbital period close to 1⁄2, 1⁄3, or 2�...

flamen

(Encyclopedia)flamen flāˈmĕn [key], in Roman religion, one of 15 priests, each concerned with the cult of a particular deity. The most honored were those dedicated to Jupiter, Mars, and Quirinus. ...

superior planet

(Encyclopedia)superior planet, planet whose orbit lies outside that of the earth. The superior planets are Mars, Jupiter, Saturn, Uranus, and Neptune. ...

evening star

(Encyclopedia)evening star or morning star, planet that becomes visible in the western sky shortly after sunset or in the eastern sky shortly before sunrise. It can usually be seen in twilight, when it is too light...