Original version

BBC Four

Knowledge, arts, music and culture from the UK and the world.

BBC Four reflects arts, music and culture with an ambitious range of intellectually and culturally enriching programmes, taking an expert and in-depth approach to its subjects.

BBC Four HD

Horizon

Documentaries

Factual

Factual: Science & Nature

Factual: Science & Nature: Science & Technology

Horizon tells amazing science stories and reveals worlds you've never seen before.

Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.

Simulcast of network BBC Two in high definition.

BBC Two HD

BBC Two Scotland

BBC Two Northern Ireland

Until 03/01/2009 BBC Two Wales (analogue) was known simply as BBC Two Wales. BBC Two Wales (digital) was BBC 2W. From 03/01/2009 BBC Two Wales schedules on both analogue and digital became identical

BBC Two Wales

BBC Two England

England

Charles Colville

Jonathan Renouf

Aidan Laverty

Horizon: Comet of the Century: A Horizon Special

Comet of the Century: A Horizon Special

23/11/2013

BBC Two - Horizon, Comet of the Century: A Horizon Special

Documentary on Comet ISON, which was hoped to be the most spectacular comet in many years.

Once hoped to be the most spectacular comet in a generation, Horizon examines the insights Comet ISON might bring to some of science's greatest mysteries.

It was hoped that Comet ISON could be the brightest and most spectacular comet for a generation. After travelling towards the sun for ten thousand years, it appeared to have been disintegrated by the heat and tidal forces of the sun in early December 2013. 

But ISON's tail of vapourised gas and water, hundreds of millions of kilometres long, may give insights into some of the greatest mysteries of science. It could help explain the origins of the solar system, whether earth's water was delivered on comets and even whether we are alone in the universe.

BBC Two

Knowledge, drama, comedy and the arts for a broad adult audience.

BBC Two is a lively channel of depth and substance, carrying a range of knowledge-building programming complemented by great drama, comedy and arts.

Accessibility links

Programme Index

Horizon

Comet of the Century: A Horizon Special

Contributors

Genres

Formats

Brand

BBC Four HD

About BBC Four