Six years ago we ran a debate, 'Bang Goes The Big Bang', which posed challenges to the idea that the universe began with the Big Bang. And the doubts are growing. In order to maintain the Big Bang theory cosmologists 'invented' dark matter and dark energy for which we have no direct evidence and supposedly make up 95% of the universe. New experimental data continues to add further challenges to the theory.

Can refinements retain the Big Bang theory? Should we look for radical alternatives? Or more fundamentally is cosmology itself in crisis and our account of ourselves and the universe an illusion?

Pioneering cosmologist Laura Mersini-Houghton, philosopher of science Bjorn Ekeberg, and astronomer and popular science writer Chris Impey ask whether the Big Bang was really the beginning.

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