About 20 billion or so years ago. the explosion of a super-dense ball of matter signalled the beginning of the Universe - at least according to the ' Big Bang ' theory. But does this theory account for all the curious astronomical phenomena that have been observed? John Maddox asks PROFESSOR JEAN-CLAUDE PECKER Of the College de France in Paris, and PROFESSOR MARTIN REES of the Institute of Astronomy at Cambridge: are there any holes in the Big Bang theory?
Producer GEOFF DEEHAN