Question: When Einstein learned about Hubble's work showing that the universe of galaxies is expanding, he called his introduction of the cosmological constant into his general

When Einstein learned about Hubble's work showing that the universe of galaxies is expanding, he called his introduction of the cosmological constant into his general theory of relativity his "biggest blunder." Can you think of other "big blunders" from the history of astronomy, where the thinking of astronomers was too conservative and the universe turned out to be more complicated or required more "outside-the-box" thinking?

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