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A changing universe

This timeline chronicles breakthroughs in astronomy that have altered how humans view the universe.
We've come a long way in our understanding of the universe since our ancient ancestors began looking up at the sky. This timeline shows some of the ways our view of the universe has changed through the past few millennia. A very long time ago: Earth was considered fixed and immobile. The "firmament," as the starry sky was known, slowly turned overhead. Moving bodies (the sun, the moon, and the planets) were associated with gods. Because these objects moved within a certain group of constellatio...

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