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Uranus ......

Physical Characteristics [edit]

Until recently it was thought that all the planets be classified as a gas giant planets are built similarly, but research using space probes have shown that the structure and chemical composition of Uranus largely distinguish it from Jupiter and Saturn. First of all uranium contains relatively little hydrogen - 15%, and only a small admixture of helium (these elements are major components of larger planets). Its mass is about 14 Earth masses. It is the lightest of the gaseous planets. Has a much colder core than the other gas planets in space and radiates very little heat. Internal structure

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In the center of Uranus is probably a small rocky core, bringing together approximately 24% of the planet. It is surrounded by a thick coat composed of ice, solidified ammonia and methane (65%). The remaining 11% is the liquidity-gas shell surface, which passes gradually into the atmosphere, consisting of 83% hydrogen and 15% helium and at lower altitudes and with methane (2%) and ammonia, often forming clouds.

distinctive turquoise hue gives Uranus admixture of methane contained in the atmosphere, which absorbs red color.

Chart On Computer Memory

Uranus ... Uranium

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When Sir William Herschel saw the planet on March 13 1781 years considered it a comet, and his discovery announced April 26, 1781: Account of a Comet, By Mr.. Herschel, FRS; Communicated by Dr.. Watson, Jun. of Bath, FRS, Philosophical Transactions of the Royal Society of London, Volume 71, pp. 492-501. Herschel originally named object Georgium Sidus (George's Star), based on the considerations on the part of the English king George III. When it became clear that the object is a planet, Herschel changed its name to Georgian Planet. Although the name could not be accepted anywhere outside the United Britain, the idea of \u200b\u200bHerschel unexpectedly resulted in receiving a lifetime pension from the treasury of the Crown.

In 1784, Jérôme Lalande proposed that a planet called Herschel, has also created its symbol. His proposal was adopted by French astronomers. Erik Prosperin from Uppsala suggested names Astraea, Cybele, and Neptune (and later assigned them to two Asteroids and eighth planet). Anders Lexell St. St. Petersburg has fluctuated between Neptune and Neptune George II of Great Britain. Daniel Bernoulli proposed the name of Berlin Hypercronius and Transaturnis, Georg Lichtenberg in Göttingen, preferred the name Austräa. Also been proposed the name of Minerva. Finally

Johann Bode, the editor of the German Berliner Astronomisches Jahrbuch vintage, supported the name Uranus (Uranus) - from the Greek god Uranus, the son of Gaia. Maximilian Hell appreciated that name, using it in the first, issued in Vienna, ephemerides.

first models Monthly Notices of the Royal Astronomical Society from 1827 show that the name Uranus (Uranus) was already widely accepted term, even among the British, and used the name Georgium Sidus few Englishmen. The last point of resistance was HM Nautical Almanac Office, which has adopted the name "Uranus" only in 1850 year.

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Uranus - the seventh in the order from the Sun, the planet of the Solar System. It is also the third largest and fourth most massive planet of our system. Belongs to a group of gas giants. The name planet comes from the Greek god Uranus. This is an exception as all the other planets are named after Roman gods. Uranus symbols are ♅ (Unicode U 2645, in astrology), and Astronomical symbol of Uranus (in astronomy). Has 27 discovered moons.

discovery and naming of Uranus

In antiquity Uranus was not known. He was discovered by William Herschel in 1781. The planet has been observed many times before, but each time it was considered to be a star. The first documented observations of the planet from 1690, when John Flamsteed cataloged it as 34 Tauri. Flamsteed observed Uranus twice, in 1712 and 1715. James Bradley made observations in the years 1748, 1750 and 1753, and Tobias Mayer in 1756. Pierre LEMONNIER observed Uranus in 1750 four times, twice in 1768, six in 1769 and the last time in 1771. The French astronomer, was the victim of his own carelessness - his observations was found later in a paper bag used to store powder dryer.