Some things in the universe are in motion; maybe you are right now, your heart certainly is. Every motion was caused by something else. But how, or who, first caused the universe to come into existence? Gillian Anderson breaks down Thomas Aquinas’ theory.

Narrated by Gillian Anderson. Scripted by Nigel Warburton.

From the BBC Radio 4 series about life's big questions A History of Ideas. http://www.bbc.co.uk/historyofideas

This project is from the BBC in partnership with The Open University, the animations were created by Cognitive.