The Constant's Comeback: A Lesson in Cosmological Humility The universe has a way of humbling even its most brilliant observers.
Albert Einstein, the father of general relativity, once introduced a "cosmological constant" (Lambda) to his equations – only to later abandon it as a mistake.
Now, this very concept has come full circle, forming the backbone of our modern understanding of cosmic expansion. A century ago, Einstein's attention turned from gravity itself to the fate of the universe.