The Big Bang theory crucially depends on the 'inflation' hypothesis that at the outset the universe expanded many orders of magnitude faster than the speed of light. But experiments have failed to prove evidence of cosmic inflation and since the theory's inception it has been beset by deep puzzles.  Now one of its founders, Paul Steinhardt has denounced the theory as mistaken and 'scientifically meaningless'.  Cosmology, it seems, is in crisis once again.

Do we have to give up the theory of cosmic inflation and seek a radical alternative?  Might alternative theories like the Big Bounce, or abandoning the speed of light provide a solution?  Or are such alternatives merely sticking plasters to avoid the more radical conclusion that it is time to give up on the Big Bang altogether?

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