注目の話題: 30代。自分の老いを受け入れられない。; この誘い方って好意が見えてしまっていますか？; 子供に甘える父親

Let's enjoy English!

No.387　13/04/02 21:29
燻し銀三 ( 50代 ♂ Oe38xe ) あ+あ-

【Being under a starlit sky】

The moon's revolution 公転 is equal to its rotation 自転.When the moon revolves around the earth,it always turns its same part to the earth.Why?🌙

It is said that the moon used to rotate long,long ago,but the earth's attractive force 引力 made the mass of the moon's inside cluster,so present condition in which only the same part faces to the earth was completed.🌙
　　　　　　　
Why was the moon born? Some people say the moon is the earth's other self 分身.Opinion is divided on the subject,but the next one is convincing.🌙

The earth was born 4.5billion years ago.Then a heavy body 天体 bummed against the earth,so the earth was torn off.After that,the one which was ripped off became solid,and changed into the moon.🌙

The moon's density is light,and its core is little.The moon still has plenty of mysteries.😃

While the moon's diameter is about 3500km,the earth's one is 13000km.The moon is larger than we expect.Roughly speaking,the earth is 4times as big as the moon.🌙