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Uranus is the seventh planet from the Sun; it is the third largest and fourth most massive planet in the solar system. Uranus was the first planet discovered in modern times. Though it is visible to the naked eye like the five classical planets, it was never recognised as a planet by ancient observers due to its dimness. Sir William Herschel announced its discovery on March 13, 1781, expanding the known boundaries of the solar system. Uranus' atmosphere, although similar to Jupiter and Saturn in being composed primarily of hydrogen and helium, contains a higher proportion of "ices" such as water, ammonia and methane, along with the usual traces of hydrocarbons. It has the coldest planetary atmosphere in the solar system, with a minimum temperature of 49 K, and has a complex layered cloud structure in which water is thought to make up the lowest clouds, while methane makes up the uppermost layer of clouds. In 1986, images from the Voyager 2 space probe showed Uranus as a virtually featureless planet in visible light without the cloud bands or storms associated with the other giants. The wind speeds on Uranus can reach 250 m/s (560 mph).
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Titania is the largest
moon of
Uranus and the
eighth largest moon in the
Solar System. Discovered by
William Herschel in 1787, Titania is named after the
queen of the fairies in Shakespeare's
A Midsummer Night's Dream. Titania consists of approximately equal amounts of ice and
rock, and is likely differentiated into a rocky
core and an icy
mantle. A layer of liquid water may be present at the
core–mantle boundary. The surface of Titania, which is relatively dark and slightly red in color, appears to have been shaped by both impacts and
endogenic processes. It is covered by numerous
impact craters reaching 326 km in diameter, but is less heavily cratered than the surface of Uranus' outermost moon,
Oberon. Titania's surface is cut by a system of enormous
canyons and
scarps; the result of the expansion of its interior during its later evolution.
Infrared spectroscopy conducted from 2001 to 2005 revealed the presence of water
ice as well as
carbon dioxide on the surface of Titania, which in turn suggested that the moon may possess a tenuous carbon dioxide
atmosphere with a surface pressure of about one 10 trillionth of a
bar. In January 1986
Voyager 2 spacecraft took several images of Titania, which allowed mapping of about 40% of the moon’s surface.
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Born in
Bolton, he made his fortune as a beer
brewer, which enabled him to indulge his interest in
astronomy. He built an observatory near
Liverpool with a 24-inch (610 mm) reflector
telescope. In 1846 Lassell discovered
Triton, the largest
moon of
Neptune, just 17 days after the discovery of Neptune itself by
German astronomer
Johann Gottfried Galle. In 1848 he independently co-discovered
Hyperion, a moon of
Saturn. In 1851 he discovered
Ariel and
Umbriel, two new moons of
Uranus.
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