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Selasa, 14 Oktober 2008
Mercury
Mercury is the smallest planet in the solar system and also the nearest to the sun with a tense 88-day revolution. The brightness of this planet ranges between -2 to 5.5 in Apparent magnitude, but not easily visible because the sun angle viewpoint with a small (by far the most rentangan of 28.3 degrees. Mercury can only be seen at dawn or Granted. Not so much that is known about Mercury because only one aircraft that outer space is never coming Mariner 10 in 1974 until 1975. Mariner 10 only succeeded in mapping about 40 to 45 percent of the planet's surface.
Similar to the Moon, Mercury has many craters and has no natural satellites and the atmosphere. Mercury has an iron core that creates a strength of magnetic fields with 0.1% of the strength of magnetic fields earth. Mercury from the surface temperature ranges between 90 to 700 Kelvin (-180 to 430 degrees selsius),
Mercury recorded observations of the earliest starts from the Sumerian era in the millennium BC to three. Roman named the nation this planet with the name of one of their god, Mercury (also known as Hermes in Greek mythology and Nabu in Babilonia mythology). Astronomical symbol for Mercury is the abstraction from the head of the god Mercury with a winged hat above the caduceus. Greek era in Hesiod named Mercury Stilbon and Hermaon as before to five centuries BC before they think that Mercury is two different things outer space, the only one visible at the time of sunrise and the only one who looks at the sunset. In India, Buddha named Mercury (बुध), Candra children from the moon. In the culture of China, Korea, Japan and Vietnam, Mercury called "star water." The people of calls them Kokhav Hebrew Hamah (כוכב חמה), "the star of the summer" ( "hot" mean sun). Mercury diameter 40% smaller than the Earth (4879.4 km), and 40% larger than the Moon. Size is also smaller (though more solid) than Jupiter moon, Ganymede, and Saturn moon, Titan.
In Structure
With a diameter of 4,879 km in the equator, the planet Mercury is the smallest of the four kebumian planet in the solar system. Mercury consists of 70% and 30% of the metal, silicate and have a density of 5.43 g/cm3 is only slightly below the density of Earth. However, when the effects of gravity pressure is not counted, the Mercury more solid with a density of the Earth not terkompres from 5.3 g/cm3 Mercury and Earth is only 4.4 g/cm3.
Mercury density is used to infer the structure. The high density of Earth are created because the gravity pressure, especially in the core. Mercury, but much smaller and not part of the earth so that there is such a high kepadatannya predicted that the planet's core has a large and rich iron. Experts estimate that the earth's core Mercury occupy 42% of the volume (the core of Earth only occupy 17% of the volume of Earth). According to the latest research, the possibility of Mercury's core is liquid.
Coat a 600 km core shroud crust of Mercury and Mercury suspected setebal 100 to 200 km. The surface of Mercury has many hills are thin, some reaching hundreds of kilometers long. This hilly suspected as the core and mantle Mercury freeze and shrink when the crust is silent.

Mercury containing iron, more than any other planet in the solar system and several theories have been proposed for explained. The theory most widely accepted is that Mercury has initially metal-silicate comparison with the similar shooting Kondrit and generally have a mass about 2.25 times that massanya now. However, in the early history of solar system, Mercury tertabrak by a planetesimal the size of around seperenam from massanya. Impact has been most of the release of the crust and mantle original Mercury and essentially leave. The same process has also been proposed to explain the creation of the Month.
The other theory states that Mercury may have formed from velablu Solar energy output before the sun has been stable. Mercury initially have two massanya from now, but with mengambangnya protomatahari, the temperature around the mercury could reach around 2,500 to 3,500 Kelvin, and may reach 10,000 Kelvin. Most of the surface of Mercury will evaporate as the temperature, the atmosphere create a "steam stone" that may tertiup by solar wind
The third theory that lead to a tug on the particles from which Mercury will be formed so that the particles are more lightweight materials missing from pengimbuhan. Each of these theories predict the order in which different surfaces. Two outer space mission in the future, Messenger and BepiColombo will be to test these theories.
posted by global article @ 19.37  
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