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Curated by: For the Love of Physics (233 videos)
Einstein originally rejected the idea of an expanding universe, modifying his equations with a "cosmological constant" to keep it static. But after Edwin Hubble discovered galaxies moving apart, Einstein admitted his mistake. Interestingly, today's accelerating expansion of the universe brought back Einstein's discarded idea, now attributed to the mysterious force we call dark energy. Einstein’s greatest blunder wasn't a blunder after all!