Tuesday, June 12, 2012
The second smallest planet Mercury in the Solar system following Pluto (no more Pluto creature a planet, Mercury become smaller) and also the least thick of the four rocky worlds close to the Sun are grouped in the classification of the planets land called by its composition. It follows through respect by Mariner 10, NASA; the center of Mercury was melted by the lava that flowed to the surface, in addition, Mariner found a weak magnetic field. To the knowledge acquired, it is believed that the magnetic fields remain even if the interior part is melted.
Mercury's feeling is collected mainly of hydrogen and helium, visible up to 600 km of the planet's surface. The temperature of the side facing the Sun is about 400 degrees and then has a violent descent to 200 degrees below zero at night.
Mercury was created from other planetesimals revolving around the sun when newly born. Almost all bodies fell on average larger rocky planets, but it seems that Mercury escaped the rules. It is estimated that Mercury was hit by another large planetesimal, escaping the destruction of miracle, but this tremendous impact, destroyed its outer layers. Because of the tremendous impact its orbit should vary dramatically, so much so that we consider the possibility that Mercury has begun its existence outside the orbit of Mars.
Mercury's outside, remains almost equal to the earliest days of the solar system, its surface has plenty of scars from the impacts product received in the first few hundred million years of our system. Notwithstanding this, it is considered that Mercury not altered its appearance in the last 3500 years.
Group (Earth = 1): 0.056
Equatorial radius: 2,439 km
Indicate density (water = 1): 5.44
Ecuador surface gravity: 0.28
Escape rate in Ecuador: 4.3 km / s
Preference of the axis of rotation perpendicular with respect to the orbit: 2 °
Distance from Sun: 57,910,000 km
Period of day: The Mercury's sidereal day is equal to 58.65 days ground (a solar day on Earth last 176 days correspondent to two "years Mercurial").
Length of year: 87.97 days. Natural satellites: You do not have natural satellites. Atmospheric composition Helium: 42% Sodium 42% Oxygen: 15% other: 1%
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