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Does Time Really Exist

2011 Science

Time is woven into the fabric of the universe as one of the dimensions in which we live our daily lives. But maybe it is only a brain state that we use to piece together events. Could it exist only in our minds? Your sense of time can be totally different than the person next to you. This and other theories illustrate that time is an illusion ... and does not really exist. The world's top physicists tackle this fundamental question, does time exist, and offer new ways to perceive the physical world. Show More

Series: Through the Wormhole

Hiding in the Light

2014 Science

This episode explores the wave theory of light as studied by mankind, noting that light has played an important role in scientific progress, with such early experiments from over 2000 years ago involving the camera obscura by the Chinese philosopher Mozi. Tyson describes the work of the 11th century Arabic scientist Ibn al-Haytham, considered ... to be one of the first to postulate on the nature of light and optics leading to the concept of the telescope, as well as one of the first researchers to use the scientific method. Tyson proceeds to discuss the nature of light as discovered by mankind. Work by Isaac Newton using diffraction through prisms demonstrated that light was composed of the visible spectrum, while findings of William Herschel in the 19th century showed that light also consisted of infrared rays. Joseph von Fraunhofer would later come to discover that by magnifying the spectrum of visible light, gaps in the spectrum would be observed. These Fraunhofer lines would later be determined to be caused by the absorption of light by electrons in moving between atomic orbitals when it passed through atoms, with each atom having a characteristic signature due to the quantum nature of these orbitals. This since has led to the core of astronomical spectroscopy, allowing astronomers to make observations about the composition of stars, planets, and other stellar features through the spectral lines, as well as observing the motion and expansion of the universe, and the existence of dark matter. Show More

Series: Cosmos: A Spacetime Odyssey

Walking with Cavemen: First Ancestors

2003 History

It's 3.5 million years ago and in East Africa a remarkable species of ape roams the land. Australopithecus afarensis has taken the first tentative steps towards humanity by standing and walking on two legs. The rift valley was forming, and the rain forests dying as Africa dried out - turning the landscape into a mosaic of scattered trees and ...grass. In this new environment afarensis found it more efficient to move about on two legs rather than four. Show More

Series: Walking with Cavemen

Life: Birds

2009 Nature

Birds owe their global success to feathers - something no other animal has. They allow birds to do extraordinary things. For the first time, a slow-motion camera captures the unique flight of the marvellous spatuletail hummingbird as he flashes long, iridescent tail feathers in the gloomy undergrowth. Aerial photography takes us into the sky ...with an Ethiopian lammergeier dropping bones to smash them into edible-sized bits. Thousands of pink flamingoes promenade in one of nature's greatest spectacles. The sage grouse rubs his feathers against his chest in a comic display to make popping noises that attract females. The Vogelkop bowerbird makes up for his dull colour by building an intricate structure and decorating it with colourful beetles and snails. Show More

Series: Life

Life and Death of a Star

2007 Science

Ignited by the power of the atom, burning with light, heat and wrath, stars are anything but peaceful. They collide, devour each other, and explode in enormous supernovas--the biggest explosions in the Universe.

Series: The Universe

What the World is Waiting for - British Indie

2007 Art

British Indie music was once seen as the bastion of the over earnest 'High Fidelity' snob who would sneer at chart success. the indie label was the redoubt against the forces of mediocrity and was a precious source of integrity and honesty. A generation would find meaning in the music of The Smiths, the archetypal indie group of the 1980's. F ...rom the Stone Roses, the heir manque of the indie music crown, via Suede’s dark sexuality and the media saturation of Brit-pop's Blur v Oasis, indie was now a marketing device, ultimately losing any of it's once cherished intimacy and integrity Show More

Series: Seven Ages of Rock

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