Can scientists solve the greatest problem in cosmology?
What came before the Big Bang? It's the science question people most want answering and one that scientists traditionally dismissed as naive. Space and time, they would tell you, began with the Big Bang, so to ask what happened before makes no sense. However, since the irritating arrival of 'dark energy' plunged cosmology into a period of self-doubt, the question of what came before has re-emerged and is being tackled by some of the brightest minds in physics. Horizon takes an incredible journey through mind-bending theories into the land before time.
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