Dark Energy
In Our Time17 Mars 2005

Dark Energy

Melvyn Bragg and guests discuss 'dark energy'. Only 5% of our universe is composed of visible matter, stars, planets and people; something called 'dark matter' makes up about 25% and an enormous 70% of the universe is pervaded with the mysteriously named 'dark energy'. It is a recent discovery and may be only a conjecture, but it has been invoked to explain an abiding riddle of the cosmos: if the expansion of the universe is powered by the energy of the Big Bang, then why isn't the expansion slowing down over time as the initial energy runs down and the attractive force of gravity asserts itself? Scientists had predicted a Big Crunch as the logical opposite of the Big Bang, but far from retracting, the expansion of the universe is actually accelerating...it's running away with itself.How do we know that the universe is behaving like this and what's causing it? If dark energy is the culprit, then what is this elusive, though omnipresent entity?With Sir Martin Rees, Astronomer Royal and Professor of Cosmology and Astrophysics, Cambridge University; Carolin Crawford, Royal Society University Research Fellow at the Institute of Astronomy, University of Cambridge; Sir Roger Penrose, Emeritus Rouse Ball Professor of Maths at Oxford University.

Avsnitt(1083)

Margaret Beaufort

Margaret Beaufort

Misha Glenny and guests discuss the woman who, as a child bride, became mother to the boy who would eventually become the first king in the Tudor dynasty. Lady Margaret Beaufort (c1443-1509) was twelv...

2 Apr 54min

The Columbian Exchange

The Columbian Exchange

Misha Glenny and guests discuss the exchange of cultures and biology across the Atlantic and Pacific after 1492. That was when Columbus reached the Bahamas, a time when Europe had no potatoes, tomatoe...

26 Mars 52min

John Keats

John Keats

Misha Glenny and guests discuss the short life and lasting works of Keats (1795-1821), who in one year wrote some of the most loved poems in English. Among these are Ode to a Nightingale, Ode on a Gre...

19 Mars 48min

The Code of Hammurabi

The Code of Hammurabi

Misha Glenny and guests discuss the laws that Hammurabi (c1810 - c1750 BC), King of Babylon, had carved into a black basalt pillar in present day Iraq and which, since its rediscovery in 1901 in prese...

12 Mars 49min

Henry IV Part 1

Henry IV Part 1

Misha Glenny and guests discuss one of the most successful of Shakespeare's plays in his own time. Written with no Part 2 in mind as 'Henry the Fourth', the play explores ideas about who can be a legi...

5 Mars 51min

The Roman Arena

The Roman Arena

Misha Glenny and guests discuss the countless venues across the Roman Empire which for over five hundred years drew the biggest crowds both in the Republic and under the Emperors. The shows there deli...

26 Feb 50min

The Mariana Trench

The Mariana Trench

Misha Glenny and guests discuss one of the wonders of the natural world. In 1875 in the western Pacific, the crew of HMS Challenger discovered the Mariana Trench which turned out to be deeper than Ev...

19 Feb 58min

On Liberty

On Liberty

Journalist, author and historian Misha Glenny presents his first edition of In Our Time, succeeding Melvyn Bragg who retired from this role last summer. Misha and his guests discuss the landmark work ...

12 Feb 49min

Populärt inom Historia

massmordarpodden
p3-historia
historiska-brott
kod-katastrof
motiv
olosta-mord
rss-historiska-brottslingar
historiepodden-se
rss-seriemordarpodden
rss-historien-om
rss-massmordarpodden
historianu-med-urban-lindstedt
rss-brottsligt
krigshistoriepodden
mannen-utan-spar
harrisons-dramatiska-historia
obskyr-historia
bedragare
vetenskapsradion-historia
rss-folkets-historia