PodParley PodParley
PodParley
Ageing the Earth episode artwork

EPISODE · Nov 20, 2003 · 28 MIN

Ageing the Earth

from In Our Time: Science · host BBC Radio 4

Melvyn Bragg and guests discuss the age of the Earth. It was once thought that the world began in 4004 BC. Lord Kelvin calculated the cooling temperature of a rock the size of our planet and came up with a figure of 20 million years for the age of the Earth. Now, the history of our planet is divided into four great Eons: the Hadean, the Archaen, the Proterozoic and the Phanerozoic. Together, they are taken to encompass an incredible four and a half billion years. How can we begin to make sense of such a huge swathe of time? And can we be sure that we have got the Earth's age right? Geologists use Eras, Periods and Epochs to further punctuate what's known as 'Deep Time', but can we be sure that the classifications we use don't obscure more than they reveal? With Richard Corfield, Research Associate in the Department of Earth Sciences at Oxford University; Hazel Rymer, Senior Lecturer in the Department of Earth Sciences at the Open University; Henry Gee, Senior Editor at Nature.

Episode metadata supplied by the publisher feed · Published Nov 20, 2003

What this episode covers

Melvyn Bragg and guests discuss the age of the Earth. It was once thought that the world began in 4004 BC. Lord Kelvin calculated the cooling temperature of a rock the size of our planet and came up with a figure of 20 million years for the age of the Earth. Now, the history of our planet is divided into four great Eons: the Hadean, the Archaen, the Proterozoic and the Phanerozoic. Together, they are taken to encompass an incredible four and a half billion years. How can we begin to make sense of such a huge swathe of time? And can we be sure that we have got the Earth's age right? Geologists use Eras, Periods and Epochs to further punctuate what's known as 'Deep Time', but can we be sure that the classifications we use don't obscure more than they reveal? With Richard Corfield, Research Associate in the Department of Earth Sciences at Oxford University; Hazel Rymer, Senior Lecturer in the Department of Earth Sciences at the Open University; Henry Gee, Senior Editor at Nature.

PodParley-generated summary based on available episode metadata and transcript content.

NOW PLAYING

Ageing the Earth

0:00 28:07

No transcript for this episode yet

We transcribe on demand. Request one and we'll notify you when it's ready — usually under 10 minutes.

Share this episode

Similar Episodes

Food Saved My Life

Mar 19, 2026 ·34m

Eat More Vegetables: The 4 Foods That Beat Ozempic (Naturally)

Feb 18, 2026 ·11m

How to End Heart Disease with Dr. Fuhrman

Feb 11, 2026 ·45m

Revolutionizing Breast Health: QT Imaging, Overdiagnosis, and What to Do Instead

Jan 27, 2026 ·35m

The Dark Side of the Supplement Industry

Nov 12, 2025 ·35m

Electrolytes, Energy, and the Deadly Salt Fix

Oct 17, 2025 ·40m

Similar Podcasts

MG Show MG Show The MG Show, hosted by Jeffrey Pedersen and Shannon Townsend, is a leading alternative media platform dedicated to uncovering the truth behind today’s most pressing political issues. Launched in 2019, the show has grown exponentially, offering unfiltered insights, comprehensive research, and real-time analysis. With a commitment to independent journalism and factual integrity, the MG Show empowers its audience with knowledge and encourages active participation in the political discourse. Eat to Live Jenna Fuhrman, Dr. Fuhrman Our health is our most precious gift and smart nutrition can change your life. Each month, join Dr. Fuhrman and his daughter, Jenna Fuhrman as they discuss important topics in the world of nutrition. Eat to Live will change the way you eat and think about food. French Your Way Jessica: Native French teacher founder of French Your Way Boost your French listening skills and test your comprehension with this one of a kind series of podcasts. Get the chance to listen to a real conversation between native speakers talking at normal speed AND customise your learning experience through carefully designed sets of questions (2 levels of difficulty) available for download at www.frenchvoicespodcast.com. All interviews also come with the transcript. French teacher Jessica interviews native speakers of French from around the world who share a bit of their life and passion. Where else would you meet in one same place a French yoga teacher based in Melbourne, a soap manufacturer from Provence, or a couple cycling around the world? HOMELAND HOMELAND The Church is a body not a building. It's the bride of Jesus Christ! Jesus is coming back for a mature bride. That means it's time for the church of Jesus Christ to move from milk to meat. This is the hour of maturity!HOMELAND is an announcement that the church is being set free. Only the church has the ability to transform the world. The kingdom's of this world will become the kingdoms of our Lord and Savior!All of creation has been waiting for this moment! Sons and daughters of God are rising up and taking their seat!

Frequently Asked Questions

How long is this episode of In Our Time: Science?

This episode is 28 minutes long.

When was this In Our Time: Science episode published?

This episode was published on November 20, 2003.

What is this episode about?

Melvyn Bragg and guests discuss the age of the Earth. It was once thought that the world began in 4004 BC. Lord Kelvin calculated the cooling temperature of a rock the size of our planet and came up with a figure of 20 million years for the age of...

Can I download this In Our Time: Science episode?

Yes, you can download this episode by clicking the download button on the episode player, or subscribe to the podcast in your preferred podcast app for automatic downloads.
URL copied to clipboard!