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12 Planets And Our Earth

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Category : » Science Earth

Source : www.pathlightsjr.com

movements of the planets became understandable if the earth was a planet and if all the . From planet Earth we can see five of the others-Mercury, Mars .

Content Summary :

Though the people of long ago watched the skies closely and made keen observations, they could not understand many things because they assumed that the earth stood still while the planets and stars moved around it. Only about 350 years ago the great Polish astronomer, Copernicus announced his startling hypothesis: The movements of the planets became understandable if the earth was a planet and if all the planets revolved about the sun. Copernicus added that the earth also turns on its axis once a day. Thus, while we are apparently watching heavenly bodies move from east to west, we are instead seeing the effects of the earth whirling eastward on its axis.

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12 Planets And Our Earth Free eBook PDF File Download