This is due to the effect known as 'Gravitational Locking'. The Earth's gravitational field slowed the Moon's spin over time and now the Moon spins about its axis at a rate such that the time to rotate once on its axis is exactly equal to the time it takes to go round the Earth. The diagram (click on the figure to see it clearly) explains how this results in effectively the same side of the Moon facing the earth all the time.
Gravitational Locking is observed in the case of other planets as well whose satellite moons are locked in the same way as the Moon is locked to the Earth.
11 comments:
真正的愛心，是照顧好自己的這顆心。........................................
人不能像動物一樣活著，而應該追求知識和美德..................................................
憤怒，是片刻的瘋狂。 ....................................................
這麼好的部落格，以後看不到怎麼辦啊！！......................................................................
Quietude is the crown of life.............................................................
喜歡看大家的文章，每篇都是一個故事，都是一種心情~~祝大家開心愉快............................................................
培養健全孩子最好的方法是父母先成為健全的人。............................................................
如此動感的blog!!!..................................................................
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宇宙萬物中，沒有比人的存在更值得驚訝的！是怎樣的緣份讓我能在分享你的心情~~............................................................
世間事沒有一樣沒有困難，只要有信心去做，至少可以做出一些成績。..................................................
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