2015年8月10日月曜日

7 Solar System【What is the Universe?】Dialogue with the Universe

7 Solar System【What is the Universe?】Dialogue with the Universe

・The solar system is considered to be located about 25,000 ~28,000 light years away from the center of the Milky Way(100,000 light years in diameter).
• There are 200 billion stars in the Milky Way galaxy.
• The solar system is orbiting in the galaxy at a speed of 220km / s, for about one orbiting of the galaxy about 226 million years.
Source: 太陽系-Wikipedia
・Revolution speed of the Earth is 30km per second.

・The brightness of the sun was only about 70% of the current in 4.6 billion years ago when the solar system was born, that has been increasing the brightness gradually thereafter. 
・The sun continues to increase the brightness at a rate of 1% in about 100 million years now.
Source: スノーボールアース-Wikipedia

太陽系
※ The most inner orbital is the orbit of Mars. 
※ Reference:Wikipedia “Oort cloud”

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