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In 1929 astronomer Edwin Hubble was studying the light spectra of galaxies and announced that his observations showed that many galaxies were redshifting — they were in fact moving away from us. But what he’d actually discovered was the expansion of the universe. Those galaxies weren’t just speeding away on their own, the very fabric of space-time itself was ballooning outward. He didn’t believe this was evidence of expansion; it would take another 70 years before scientists realized that not only was the universe expanding –– the expansion was speeding up.

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