We've all been there: you figure out a problem, then second-guess yourself only to figure out later that if you'd gone with your first hunch, you'd have been right all along. Albert Einstein was no different. His general theory of relativity was a breakthrough in our understanding of the universe, but his equations predicted something he didn't think could be right. So he changed them. Turns out that his original equations were right on the money, but what he added to them — what's known as the cosmological constant — has been useful all the same.
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Written by Ashley Hamer September 22, 2017
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