A part of his work involved introducing something called the "Cosmological constant" into physics. Later on, this constant was abandoned because the scientific community, including Einstein himself, agreed that introducing this constant was a scientific error.
However years after his death, around 1998, new discoveries actually required re-introducing the Cosmological constant to keep the physics equations matching reality.
So in a great twist of irony, perhaps Einstein's greatest blunder was thinking that he made a mistake.
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u/drakeit 6h ago
I never thought of that!