Early Universe
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In the first second after the explosion, gravity and the laws governing physics were produced, in that order. Different particles came after physics, and hydrogen and helium came from nuclear reactions caused by the Big Bang. In three minutes, all of the particles that make up everything that is or ever would being the universe existed. After the Big Bang, the universe was smooth, intense and so hot that it glowed and looked opaque. As matter started to spread out, it spread out irregularly and made clumps in the matter spread. A few particles got close enough to each other to be connected by electrostatic forces; these clumps formed planets, stars, etc.
Early Earth
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In the beginning, Earth was a hot rock surrounded by poisonous gases and covered in poisonous oceans. Chemicals washing into the oceans reacted and formed molecules. Earth was one-third of its present size when its atmosphere started forming (scientists think that dark energy is responsible for Earth’s expansion). Early Earth’s atmosphere didn’t have any ammonia, methane, or hydrogen, had little to no oxidizing compounds, and low carbon dioxide levels. Oxygen in the atmosphere reacted with ultraviolet (UV) rays and created a protective layer of ozone around the Earth, while water formed from gases in the sky from volcanoes, water vapor raining down and meteors from outside our solar system.