In Our Time Folgen

Melvyn Bragg and guests discuss our knowledge of the planets in both our and other solar systems. 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?With 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.

Melvyn Bragg and guests discuss the ideas and politics behind the idea of religious toleration. In 1763 Voltaire remarked that "of all religions, the Christian is undoubtedly that which should instil the greatest toleration, although so far the Christians have been the most intolerant of all men". Christian intolerance was brutally enforced across Western Europe in the Middle Ages and the Reformation, with inquisitions, executions, church courts and brandings with hot irons. But during the English Civil War a variety of Christian sects sprang up which challenged the imposition of state religion and opened the floodgates to religious diversity.What were the politics and philosophy behind the idea of toleration in England? Did the rise of toleration go hand in hand with the rise of the secular, or were tolerationists – in fact – deeply religious? And how does toleration differ from tolerance?With Justin Champion, Professor of the History of Early Modern Ideas at Royal Holloway, University of London; David Wootton, Professor of Intellectual History at Queen Mary, University of London; Sarah Barber, Senior Lecturer in History at Lancaster University.

Melvyn Bragg and guests discuss the history of the number between 1 and -1, which has strange and uniquely beguiling qualities. Shakespeare’s King Lear warned, “Nothing will come of nothing”. The poet and priest John Donne said from the pulpit, “The less anything is, the less we know it: how invisible, unintelligible a thing is nothing”, and the English monk and historian William of Malmesbury called them “dangerous Saracen magic”. They were all talking about zero, the number or symbol that had been part of the mathematics in the East for centuries but was finally taking hold in Europe.What was it about zero that so repulsed their intellects? How was zero invented? And what role does zero play in mathematics today?With Robert Kaplan, co-founder of the Maths Circle at Harvard University and author of The Nothing That Is: A Natural History of Zero; Ian Stewart, Professor of Mathematics at the University of Warwick; Lisa Jardine, Professor of Renaissance Studies at Queen Mary, University of London.