EARLY THEORIES
One of the earliest scientific theories of the origin of the Earth may be traced to the German philosopher Immanuel Kant. In 1755, he proposed that the solar system was the result of a rotating cloud of gas called a Nebula. Gravity would have condensed some of the particles within the cloud into planet like globs, he suggested. The rotation of the primordial gas cloud can still be felt today, he added, in the spinning motion of the Sun and that of the planets, which rotate both around the Sun and about their own axes.
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