byRichard Meckien- published Mar 16, 2016 02:55 PM – – last modified Jun 04, 2019 11:41 AM

Rights: Original version in Portuguese by Mauro Bellesa.

A day has not always been 24 hours long. In fact, it began lasting only 4 hours. The reasons for this extreme variation were explained by planetary scientist Takanori Sasaki, from the Kyoto University, during the Physics Workshop of the second phase of the Intercontinental Academia (ICA), on March 9.

Sasaki said that the formation of the Earth and the Moon, 4.5 billion years ago, and the influence of the Moon on the planet are the…

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