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Uranus , in astronomy

(Encyclopedia)Uranus yo͝orāˈnəs, yo͝orˈə– [key], in astronomy, 7th planet from the sun, at a mean distance of 1.78 billion mi (2.87 billion km), with an orbit lying between those of Saturn and Neptune; its...

Cressida, in astronomy

(Encyclopedia)Cressida, in astronomy, one of the natural satellites, or moons, of Uranus. ...

Puck, in astronomy

(Encyclopedia)Puck, in astronomy, one of the natural satellites, or moons, of Uranus. ...

Ariel, in astronomy

(Encyclopedia)Ariel ârˈēəl [key], in astronomy, one of the moons, or natural satellites, of Uranus. ...

Neptune, in astronomy

(Encyclopedia)Neptune, in astronomy, 8th planet from the sun at a mean distance of about 2.8 billion mi (4.5 billion km) with an orbit lying between those of Uranus and the dwarf planet Pluto; its period of revolut...

Uranus , in Greek religion and mythology

(Encyclopedia)Uranus, in Greek religion and mythology, the heaven, first ruler of the universe, son of Gaea (the earth). He was the father of Gaea's children, the Titans, the Cyclopes, and the Hundred-handed Ones (...

astronomy

(Encyclopedia)astronomy, branch of science that studies the motions and natures of celestial bodies, such as planets, stars, and galaxies; more generally, the study of matter and energy in the universe at large. ...

ring, in astronomy

(Encyclopedia)ring, in astronomy, relatively thin band of rocks and dust and ice particles that orbit around a planet in the planet's equatorial plane. All four of the giant planets in the solar system—Jupiter, S...

infrared astronomy

(Encyclopedia)infrared astronomy, study of celestial objects by means of the infrared radiation they emit, in the wavelength range from about 1 micrometer to about 1 millimeter. All objects, from trees and building...

coma, in astronomy

(Encyclopedia)coma, in astronomy: see comet.