Space
Radiolab
00:00
Copernicus's Theory of the Universe
The then known universe was the objects of the solar system, the planets. But you look up at the night sky beyond the planets, what do you see? Stars in every direction. It wasn't until the 19 twenties where harlowe shapley noticed globular clusters,. Those were more in one direction of the sky than the other. And he deduced that these things ought to know where the centere of the gravity is. In fact, maybe they are other milky ways. Maybe they are other galaxies. We're not the whole story.
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