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In March astronomers in the BICEP2 collaboration announced they had found gravitational waves from the Big Bang. But now the evidence is being questioned by other scientists.

Dr Lucie Green reports on the debate and asks if scientists can ever know what happened billions of years ago when the universe was formed.

Image copyright: Steffen Richter, Harvard University

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29 minutes

Last on

Sun 17 Aug 2014 23:32 GMT
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