In Our Time27 Touko 2004

The Planets

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.

Tämä jakso on lisätty Podme-palveluun avoimen RSS-syötteen kautta eikä se ole Podmen omaa tuotantoa. Siksi jakso saattaa sisältää mainontaa.

Jaksot(1101)

Seashells

Misha Glenny and guests discuss a familiar feature of our beaches: seashells, from their astonishing shapes and patterns that teach us about Earth’s oceans, to the ways that humans have treasured shel...

30 Heinä 53min

Vigée Le Brun

Misha Glenny and guests discuss the French portrait painter Élisabeth Vigée Le Brun (1755 - 1842). From her teens she delighted her high society subjects in and around Paris, notably Marie Antoinette ...

23 Heinä 56min

The Delian League

Misha Glenny and guests discuss the origins and evolution of an alliance which transformed the geopolitics of the classical world: the Delian League. Since the start of the 5th Century BCE, city state...

16 Heinä 54min

Machado de Assis

Misha Glenny and guests discuss one of the towering figures of Brazilian and world literature, Machado de Assis (1839 - 1908). He was the descendant of slaves and built his career while slavery was s...

9 Heinä 53min

The Global Story - The soft power superpower, with Roman Mars

As 4th July approaches, we think you’ll like this episode of The Global Story. All week, The Global Story podcast is exploring the surprising and often hidden ways the US has shaped the modern world. ...

3 Heinä 27min

The Evolution of Trees

Misha Glenny and guests discuss the earliest evidence we have of the existence of trees and how even plants we might have on windowsills or as vegetables in gardens can and do, in the right conditions...

2 Heinä 54min

The Welsh Marches

At the Hay Festival, Misha Glenny and guests discuss the impact of the Norman invasion on the people and land of Wales and across the modern border with England in what became known as The Welsh March...

25 Kesä 52min

The Levellers

Misha Glenny and guests discuss the group which came to be known as the Levellers and emerged during what would become arguably one of the bloodiest and most turbulent periods of English history. Afte...

18 Kesä 55min