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| Solar System | Nebulae | Galaxies | Stars and Clusters | Equipment | Links Last edited - Wednesday, 25 July 2001 |
NONE AT THE MOMENT, SORRY..... |
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Technical Data:-
| Diameter | 51800 km |
| Average Distance from Sun | 2,871 million km |
| Size compared to Earth (Diameter) | 4x |
| Gravity compared to Earth | 0.79 |
| Surface temperature | -210°C |
| Length of Day | 17 hours 14 mins(Retrograde) |
| Length of Year | 84.01 Earth years |
| Eccentricity of Orbit | 0.046 |
| Moons | 21 |
| Density | 1.30gm/cm3 |
| Atmosphere | Hydrogen - 85% Helium - 12% Methane - 3% |
| When Uranus was origianlly discovered by the English astronomer Sir William Herschel, it was to be called Georgius Sidius, after King George III. Unsuprisingly though, this wasn't a very popular choice and in the end it was named Uranus after the first sky god of Greek mythology. At half the size of Saturn, Uranus is quite a big planet but it is so far away that from Earth you can't see it with the naked eye and through a telescope you can just see a tiny, blurred green blob. The reason it's green is because the Methane gas in the atmosphere absorbs red light, so all we see is the blue-green light which rebounds off it. Another strange thing about Uranus is the way it spins. It is tilted at such an angle that in summer the polar regions tend to get more sun than the equator! Suprisingly for such radical season changes though is the fact that the temperature in Uranus stays pretty constant, at -216oC to -220oC. As well as all that, Uranus is the only planet other than Venus to spin in a clockwise direction. Unknown until 1977, Uranus has actually got rings, a bit like Saturn
(though obviously to a lesser degree). These were observed on 10th March 1977 when
astronomers noticed a star they were observing blinked while it was next to Uranus.
The planet has 15 moons, 9 of which were discovered by the Voyager 2 space probe.
Many are named after characters in Shakespeare plays: Cordelia, Ophelia, Bianca, Cressida,
Desdemona, Juliet, Portia, Rosalind, Belinda, Puck, Miranda, Ariel, Umbriel, Titania and
Oberon. |
