The Age of the Universe

Melvyn Bragg and his guests discuss the age of the Universe.Since the 18th century, when scientists first realised that the Universe had existed for more than a few thousand years, cosmologists have debated its likely age. The discovery that the Universe was expanding allowed the first informed estimates of its age to be made by the great astronomer Edwin Hubble in the early decades of the twentieth century. Hubble’s estimate of the rate at which the Universe is expanding, the so-called Hubble Constant, has been progressively improved. Today cosmologists have a variety of other methods for ageing the Universe, most recently the detailed measurements of cosmic microwave background radiation - the afterglow of the Big Bang - made in the last decade. And all these methods seem to agree on one thing: the Universe has existed for around 13.75 billion years.

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Guests

• Martin Rees 9 episodes
  Astronomer Royal and Emeritus Professor of Cosmology and Astrophysics at the University of Cambridge
• Carolin Crawford 19 episodes
  Member of the Institute of Astronomy and Fellow of Emmanuel College at the University of Cambridge
• Carlos Frenk 2 episodes
  Director of the Institute for Computational Cosmology at the University of Durham

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Programme ID: b00yz3gy

Episode page: bbc.co.uk/programmes/b00yz3gy

Auto-category: 523.1 (Cosmology and astrophysics)