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Several theories have been proposed to explain the origin of the Earth. These theories can be broadly categorized into early speculative theories and more recent scientific models based on empirical evidence. Each theory attempts to explain the processes that led to the formation of the Earth from cosmic material. One of the earliest theories is the Nebular Hypothesis, first proposed by Immanuel Kant in 1755 and later modified by Pierre-Simon Laplace. According to this theory, the solar system, including the Earth, originated from a large, rotating cloud of gas and dust called a nebula. As this nebula contracted under _______ _______ _________ _________ ______.
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