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Uranus, 7th Planet from the Sun > 
Uranus is the 7th planet from the Sun. It was discovered in 1781 by William Herschel and named for the Greek god personifying heaven. A blue-green gas giant, it has almost 15 times the mass of Earth and over 50 times its volume. It is less dense than Earth; the gravity at the top of its atmosphere is 11% weaker. Its equatorial diameter is 31,800 mi (51,100 km). Uranus has 10 sharply defined narrow, dark rings, with broad dust bands between them; the rings consist mainly of boulder-size chunks of dark material. Uranus also has at least 27 moons (most named after Shakespearean characters) and a magnetic field about as strong as Earth's. The planet rotates once every 17 hours around an axis that, unusually, is almost parallel to the ecliptic; from Earth it appears to spin on its side. It takes 84 years to orbit the Sun, at a mean distance of 1.78 billion mi (2.87 billion km). It has no solid surface; its fluid interior is thought to consist of a mixture of rock, ices, and gas, with little or no rocky core. Its upper atmosphere is mostly hydrogen and helium; the blue-green colour comes from absorption of red light by the small amount of methane present.
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More on this Website >
• http://www.answers.com/uranus?cat=technology
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BIG BANG : Formation of the Universe
Ca. 13.7 billion years ago: Universe, which includes time and space, begins with Big Bang. The Big Bang is dated according to NASA. 300 thousand years after the Big Bang,... |
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Univers
The Universe today is very different from the Universe of the past and of the future. However, we can discover much about the past and the future from what we can current... |
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The Nine Planets
The Nine Planets is an overview of the history, mythology, and current scientific knowledge of each planet and the major moons in our solar system. Each page has my text... |
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Herschel, Discovered Uranus - 1781
Sir Frederick William Herschel, FRS KH, German Friedrich Wilhelm Herschel, (15 November 1738 – 25 August 1822) was a German-born British astronomer and composer who becam... |
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