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What We'll Never Know

Duration:
45 minutes
First broadcast:
Tuesday 15 June 2010

3. What We'll Never Know

In the third of this year's Reith Lectures, recorded at the Royal Society during its 350th anniversary year, its President Martin Rees continues to explore the challenges facing science in the 21st century. He stresses there are things that will always lie beyond our sphere of comprehension and we should accept these limits to our knowledge. On the other hand, there are things we've never even dreamt of that will one day be ours to explore and understand. The outcome of the quest for alien life will revolutionise our sense of self in the next two decades. But some things -- like travelling back in time -- will never happen.

  • JOIN THE CONVERSATION

    JOIN THE CONVERSATION

    During each Tuesday broadcast of the Reith Lectures the Radio 4 blog will host a live debate between 8.30 and 10am. You can also share your thoughts by following @reith_lectures on Twitter, tweet using "#reith", or email thereithlectures@bbc.co.uk

    Read and post comments on the third lecture
  • READ THE LECTURE TRANSCRIPTS

    READ THE LECTURE TRANSCRIPTS

    You can read and download the transcripts of Lord Martin Rees' series of lectures, Scientific Horizons.

    Read the lecture transcripts
  • The Open University

    The Open University

    What would a Reith lecture have covered 100 years ago? Uncover science in the past, in the present, and in the future.

    Find out more from the OU website

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