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| In Our Time
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| | | The big ideas which form the intellectual agenda of our age are illuminated by some of the best minds. Melvyn Bragg and three guests investigate the history of ideas and debate their application in modern life. | | | | | LISTEN AGAIN | | | |
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| | | | | "I'm fascinated by the fact that we live in a time when so many people are doing fantastic work, and thinking in areas which it's not remotely possible for me to keep up with & and these people are prepared to talk about it. They're prepared to come on In Our Time and other programmes on Radio 4 and try and talk to the rest of us ..." |
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|  | | PLANETS
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Tucked away in the outer Western Spiral arm of the Milky Way is a middle aged star, with nine, or possibly ten orbiting planets of hugely varying sizes. Roughly ninety-two million miles and third in line from that central star is our own planet Earth, in thrall to our Sun, just one of the several thousand million stars that make up the Galaxy.
Ever since Galileo and Copernicus gave us a scientific model of our own solar system, we have assumed that somewhere amongst the myriad stars there must be other orbiting planets, but it took until 1995 to find one. ‘51 Pegasus A’ was discovered in the Pegasus constellation and was far bigger and far closer to its sun than any of our existing theories could have predicted. Since then 121 new planets have been found. And now it is thought there may be more planets in the skies than there are stars.
What causes a planet to form? How do you track one down? And how likely is there to be another one out there with properties like the Earth’s?
Contributors
Paul Murdin, Senior Fellow at the Institute of Astronomy in Cambridge
Hugh Jones, planet hunter and Reader in Astrophysics at Liverpool John Moores University
Carolin Crawford, Royal Society Research Fellow at the Institute of Astronomy in Cambridge | | |
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