![]() ![]() ![]() Indeed, not all Big Historians are even historians. Not all Big Historians use Christian's threshold of increasing complexity to structure their history. ![]() One of those planets is our Earth, a rocky planet with a single moon, a moon that revolves around the Earth while the Earth revolves around the Sun. And gravity acted on the left-over "stuff" from the formation of the Sun to create the other planets and moons in our solar system. About 4.5 billion years ago our Sun, an average-sized star, formed as gravity compressed gases just as it does when creating other stars. The heat within stars and the heat produced when stars explode create more complex and heavier elements by fusing atoms together. Gravity compressed clouds of hydrogen gas that formed a few billion years after the Big Bang, a compression that created increasing heat and mass, until finally the first stars "lit" up. ![]() Gravity is a central actor in making the universe more complex after the Big Bang since it draws objects together. Eventually our Solar System and Earth (Threshold 4) emerged. Then, more complex and heavier elements emerged (Threshold 3). While relatively simple, these early elements and forces were enough for more complex phenomena to emerge such as stars and galaxies (Threshold 2). ![]()
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