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Back around the early 1900s, the universe was a fairly simple place. It was static, had always been there, and largely consisted of our own galaxy and a few neighboring bits of matter. Over the course of the 20th century, that view collapsed. Many sources of light were revealed not be stars, but rather galaxies like (and, in many cases, unlike) our own. Distant galaxies were found to be rocketing away from us, propelled by the unfolding of the universe itself, which has accelerated since the big bang. Modern cosmology has revealed a universe teeming with dark matter and unseen energy, entering a new stage of inflation.
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