|a theory that deduces a cataclysmic birth of the universe from the observed expansion of the universe, cosmic background radiation, abundance of the elements, and the laws of physics|
|a star in an intermediate stage of evolution, characterized by a large volume, low surface temperature, and reddish hue|
|Uranus2 (jʊˈreɪnəs, ˈjʊrənəs)|
|one of the giant planets, the seventh planet from the sun, sometimes visible to the naked eye. It has about 15 satellites, a ring system, and an axis of rotation almost lying in the plane of the orbit. Mean distance from sun: 2870 million km; period of revolution around sun: 84 years; period of axial rotation: 17.23 hours; diameter and mass: 4 and 14.5 times that of earth respectively|
|[C19: from Latin Ūranus, from Greek Ouranos heaven]|
"I cannot but wish to take this opportunity of expressing my sense of gratitude, by giving the name of Georgium Sidus ... to a star which (with respect to us) first began to shine under His auspicious reign." [Sir William Herschel, 1783]The planet was known in Eng. in 1780s as the Georgian Planet; Fr. astronomers began calling Herschel, and ult. Ger. astronomer Johann Bode proposed Uranus as in conformity with other planet names. However, the name didn't come into common usage until c.1850.
|Uranus (yr'ə-nəs, y-rā'-) Pronunciation Key
The seventh planet from the Sun and the third largest, with a diameter about four times that of Earth. Though slightly larger than Nepture, Uranus is the least massive of the four gas giants and is the only one with no internal heat source. A cloud layer of frozen methane gives it a faint bluish-green color, and it is encircled by a thin system of 11 rings and 27 moons. Uranus's axis is tilted 98° from the vertical—the greatest such tilt in the solar system—with the result that its poles are in continuous darkness or continuous sunlight for nearly half of its 84-year orbital period. See Table at solar system.