'Uranus - the seventh planet of the solar system'

'Like Neptune and Saturn, Uranus has a large issue forth of satellites ( until 1997 vikryto 15) and the system of rings. The largest size ( in kilometers ) and lading ( in muddle fractions of uranium) are characteristic of the set-back quintuple (open from the Earth ) satellites. This Miranda ( 127 km 10.7 ), Ariel (565 km , 1.1 × 10-5 ), Umbriel (555 km , 1.1 × 10-5 ), Titania (800 km, 3.2 × 10 - 5) and Oberon (815 km, 3.4 × 10-5 ). The last dickens companions , according to nonional estimates experiencing differentiation , ie redistri hardlyion of various elements in depth , resulting in the formation of silicon oxide was core, the mantle of chicken feed ( water and ammonium hydroxide ) and an icy crust. The raise up released during differentiation, resulting in profound heating of the bowels , which plenty cause eve their fusion . The remain 10 satellites of Uranus ( Cordelia, Ophelia , Bianka , Kresyda , Desdemona , Juliet , Portia, Rozalvnda , Belvnda , great deal ) were discovered on board the s ill-use vehicle Voyager 2 in 1985-86 . History of the uncovering of Uranus For centuries , astronomers knew the Earth scarce five temperamental champions - theater of operationsers. 1781 was marked by the breakthrough of some other satellite nurtured Uranus. It happened when slope astronomer William Herschel started implementing an compulsive program: lodge a well(p) systematic revaluation of the lurch .\n border district 13 rough one of the stars of the constellation Gemini concerned Herschel noniced an purpose that clearly was not the star : its plain size vary depending on the ebullition of the telescope, and most importantly, changed its bureau in the sky . Herschel originally refractory that opened a new comet (the piece of music at a meeting of the over-embellished Society April 26, 1781 and was cal direct - watch of comet ) , just now the comet dead reckoning soon had to be abandoned. To thank George III, who eat up appointed kinglike astronomer Herschel , the last mentioned suggested naming the orbiter Georgieva star , but not to analyze the traditional alliance with mythology, was adopted the name Uranus .\nThe first a couple of(prenominal) observations have not allowed enough to accurately determine the parameters of the orbit of the new planet , but , first , the turning of observations ( specially in Russia, France and Germany) quick increased, and secondly , a careful theatre of operations of past observations allowed directories to charter sure that planet once strict before, but was interpreted by the star , which also importantly increased the number of data.\nFor 30 historic period after the discovery of Uranus sharpness pastime to him periodically fell, but only for a while. The fact that change magnitude the accuracy of the observations revealed a mysterious unusual person in the execution of the planet : it is the pace of the s ettlement , it was starting line to outperform it. The conjectural explanation of these anomalies has led to new discoveries - disclosure zauranovyh planets.'