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Dark energy

Duration: 02:27

Astrophysicist Saul Perlmutter and his colleagues discovered that the expansion of the Universe is speeding up - a finding that goes against what was predicted. It was thought that the gravitational pull of all the matter in the Universe would slow down its expansion. This led scientists to propose a new, as-yet unexplained process called dark energy.

Available since: Wed 11 Aug 2010

Credits

Director
Rob Liddell
Producer
Rob Liddell
Executive Producer
Andrew Cohen
Director
Rob Liddell
Producer
Rob Liddell
Executive Producer
Andrew Cohen
Director
Rob Liddell
Producer
Rob Liddell
Executive Producer
Andrew Cohen

This clip is from

Horizon 2009-2010, Is Everything We Know About The Universe Wrong?

Investigating the discovery of what is ominously being called 'dark flow'.

First broadcast: 09 Mar 2010

Image for Is Everything We Know About The Universe Wrong? Not currently available on BBC iPlayer

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