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2013년 12월 17일 화요일

Our king, the Sun's characteristic

 Let's know about our king the Sun. Sun and Earth's distance is 150000000km Sun's mass is very big. Sun's greavity is so powerful that it can makes planets to turn the Sun. The sun's mass is 99.8% of whole solar system's mass. In morning, we can see bright sun over the sky. If sun doesn't exist, we can't live. Let's learn about Sun's characteristic.

1.Sun's orbit's characteristic

 Sun turns the center of milkiway 0.2 billions day a once. Its orbital speed is 217km/s.

2.Sun's physical characteristic

Mass:1.9891×1030 kg(330000xEarth)
Mean diameter:1,392,684 km(200xEarth)
Volume:1.412×1018 km3        
Surface Area:6.0877×1012 km
Average density:1.408×103 kg/m
Sidereal rotation period:25.05 days
Rotation period at pole:34.4days

3.Sun's photospheric composition
Hydrogen:73.46&
Helluim:24.85%
Oxygen:0.77%
Carbon:0.29%
Iron:0.16%
Neon:0.12%
Nitrogen:0.09%
Silicon:0.07%
Magnesuim:0.05%
Sulfur:0.04%


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