Cosmology
Discovery About this episode
<p>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. </p><p>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.</p><p>Image copyright: Steffen Richter, Harvard University</p>
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