Neil deGrasse Tyson explains how Albert Einstein once introduced a mathematical term into his equations to account for a static universe, a concept he later regretted and called his "greatest blunder." Einstein's equations initially suggested that the universe was either expanding or collapsing, an idea unheard of at the time. In an attempt to stabilize the universe, Einstein added a "pressure force" term to counteract gravity. However, just a few years later, Edwin Hubble discovered that the universe was indeed expanding, rendering Einstein's addition unnecessary. Ironically, in 1998, scientists found a force similar to what Einstein had proposed, known as dark energy, that pushes against gravity in the universe, validating his "blunder" in a new way!
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