Tuesday 9:00 PM on BBC Two Premiered Sep 01, 1964 In Season


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  • Do You Know What Time It Is?

    Full Episode

    S 45 : Ep 4 - 12/2/08

    Particle physicist Professor Brian Cox asks, 'What time is it?' It's a simple question and it sounds like it has a simple answer. But do we really know what it is that we're asking? Brian visits the ancient Mayan pyramids in Mexico where the Maya built temples to time. He finds out that a day is never 24 hours and meets Earth's very own Director of Time. He journeys to the beginning of time, and goes beyond within the realms of string theory, and explores the very limit of time. He discovers that we not only travel through time at the speed of light, but the experience we feel as the passing of time could be an illusion.moreless
  • How Small Is the Universe?

    Full Episode

    S 41 : Ep 5 - 9/3/12

    Horizon follows the search for the smallest thing in the universe, a journey where things don't just become smaller but also a whole lot weirder. Scientists hope to catch a glimpse of miniature black holes, multiple dimensions and even parallel universes. As they start to explore this wonderland, where nothing is quite what it seems, they may have to rewrite the fundamental laws of time and space.moreless
  • How Big is the Universe?

    Full Episode

    S 41 : Ep 4 - 8/27/12

    It is one of the most baffling questions that scientists can ask: how big is the universe that we live in? Horizon follows the cosmologists who are creating the most ambitious map in history - a map of everything in existence. And it is stranger than anyone had imagined - a universe without end that stretches far beyond what the eye can ever see. And, if the latest research proves true, our universe may just be the start of something even bigger. Much bigger.moreless
  • Solar Storms - The Threat to Planet Earth

    Full Episode

    S 40 : Ep 9 - 3/6/12

    Scientists are expecting a fit of violent activity on the sun, which will propel billions of tonnes of superheated gas and pulses of energy towards our planet. They have the power to close down our modern technological civilisation - e.g. in 1989, a solar storm cut off the power to Quebec. Horizon meets the space weathermen who are trying to predict what is coming our way, and organistions like the National Grid, who are preparing for the impending solar storms.moreless
  • The Core

    Full Episode

    S 40 : Ep 4 - 8/31/11

    For centuries we have dreamt of reaching the centre of the Earth. Now scientists are uncovering a bizarre and alien world that lies 4,000 miles beneath our feet, unlike anything we know on the surface. It is a planet buried within the planet we know, where storms rage within a sea of white-hot metal and a giant forest of crystals make up a metal core the size of the Moon. Horizon follows scientists who are conducting experiments to recreate this core within their own laboratories, with surprising results.moreless
  • Are We Still Evolving?

    Full Episode

    S 39 : Ep 14 - 3/1/11

    But thanks to modern technology and medicine, did we escape Darwin's law of the survival of the fittest? Alice follows a trail of clues from ancient human bones, to studies of remarkable people living in the most inhospitable parts of the planet, to the frontiers of genetic research to discover if we are still evolving - and where we might be heading.moreless