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🎆 THE UNIVERSE 🎆 The Universe is the whole of existence—all of space, matter, energy, and time. The Universe is so vast that it seems unimaginable, but we do know that it has been steadily expanding following its beginning 13.8 billion years ago in an explosive event called the Big Bang. @allabouteducationinfo #factsoftheday

🎆 The Big Bang 🎆 About 14 billion years ago, the Universe materialized out of nothing for unknown reasons. Infinitely smaller than an atom to begin with, the Universe expanded to billions of miles across in under a second—an event called the Big Bang. Time came into existence when the Universe began, so the question “What happened before?” has no meaning. Space also came into existence. The Big Bang was not an explosion of matter through space—it was an expansion of space itself. At first the Universe consisted of pure energy, but within a trillionth of a second some of this energy turned into matter, forming a vast soup of subatomic particles (particles smaller than atoms). It took nearly 400,000 years for the particles to cool down enough to form atoms, and then another 300 million years before the atoms formed planets, stars, and galaxies. The expansion that began in the Big Bang continues to this day, and most scientists think it will carry on forever. The expanding Universe The illustration below does not show the shape of the Universe, which is unknown. Instead, it is a timeline that shows how the Universe has expanded and changed since the Big Bang. We know the Universe is expanding because the most distant galaxies are rushing apart at rapid speeds. By running the clock backward, astronomers figured out that the expansion began 13.8 billion years ago at a single point: the Big Bang. @allabouteducationinfo #factsoftheday

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