Einstein put a number in his equations to keep the universe from collapsing, calling it his cosmological constant. Then, distant supernovas showed the universe flying apart faster and faster, so they called that force 'dark energy' and brought the constant back! But I think calling it a blunder or a comeback misses the point—the universe isn't making mistakes, it's just doing its sets and reps, expanding whether we understand it or not. Watching someone in the gym finally push past their limits, you see the same thing: a hidden force was always there, waiting for the right moment to show its strength.
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