![]() ![]() This was all still within the first second after the universe began, when the temperature of everything was about 10 billion degrees Fahrenheit (5.5 billion Celsius), according to NASA. A flood of matter and radiation, known as “reheating,” began the process of populating our universe with the stuff we know today - particles, atoms, stars, galaxies and so on. When cosmic inflation came to a sudden and still-mysterious end, the more classic descriptions of the Big Bang took hold. This was a period of cosmic inflation that lasted mere fractions of a second - about 10^-32 of a second, according to physicist Alan Guth’s 1980 theory that changed the way we think about the Big Bang forever. Then, explosive expansion began, ballooning our universe outwards faster than the speed of light. Around 13.7 billion years ago, everything we know of was an infinitesimally small singularity, a point of infinite denseness and infinite heat. ![]()
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