This year's Reith lecturer is the cosmologist and astrophysicist Professor Martin Rees.
Professor Rees has been President of the Royal Society since 2005 and is a member of the House of Lords. He has been Astronomer Royal since 1995, and is Master of Trinity College, Cambridge.
His Reith Lectures will explore the role of science as a common culture and the scope and limits of our scientific understanding.
Professor Rees will also discuss how science might further transform our lives in the rest of the 21st Century – posing new opportunities, threats and ethical challenges.
And he will consider scenarios, some optimistic, some less so, for a world in which pressures on resources and the environment will become ever more acute.