EPISODE · Dec 25, 2020 · 47 MIN
221 The Great Debate I
from The History of the Twentieth Century
By the beginning of the twentieth century, astronomers had some idea of the size and shape of our galaxy, though the consensus was that the galaxy represented the entirety of the Universe. But in the decades that followed, it became clear that the Universe was much more.
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221 The Great Debate I
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