Simply the Best Documentaries

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Are We All Bigots
The Private Life of Plants: Travelling
Toxic Iraq
Tofu: Good Sex Bad Sex
Escape from North Korea
Tony Robbins I Am Not Your Guru
Eat Fast and Live Longer
Lands of Gold
Dinosaur Planet: White Tip Journey
Into the Abyss
Chased by Sea Monsters 1of3
Basketball Diplomacy
The Last Reef
Why Does Evil Exist
Dark Net Crush
The Incredible Human Journey: America
Dark Net Rewire
Bomb It
R.E.M. by MTV
The Science of Interstellar
Clash of the Gods: Hades
Planet Dinosaur Ultimate Killers
One Voice in the Cosmic Fugue
Tales by Light Wild
What Happened Before the Beginning
Allergy Planet
Cosmic Dawn: The Real Moment of Creation
Building the Great Pyramid
Homo Interneticus
Can We Make a Star on Earth
King Arthur
Frozen Planet: Winter
Inside the Brain of a Trader
Operation Stonehenge

Order by   Views  Year  New Added  Featured  Title

A Sky Full of Ghosts
A Sky Full of Ghosts 2014

Tyson begins the episode by explaining the nature of the speed of light and how much of what is seen of the observable universe is from light emanated from billions of years in the past. Tyson further explains how modern astronomy has used such analyzes via deep time to identify the Big Bang event and the age of the universe. Tyson proceeds to describe how the work of Isaac Newton, William Herschel, and James Clerk Maxwell contributed to understanding the nature of electromagnetic waves and gravitational force, and how this work led towards Albert Einstein's Theory of Relativity, that the speed of light is a fundamental constant of the universe and gravity can be seen as distortion of the fabric of space-time. Tyson describes the concept of dark stars as postulated by John Michell which are not visible but detectable by tracking other stars trapped within their gravity wells, an idea Herschel used to discover binary stars. Tyson then describes the nature of black holes, their enormous gravitational forces that can even capture light, and their discovery via X-ray sources such as Cygnus X-1. Tyson uses the Ship of Imagination to provide a postulate of the warping of spacetime and time dilation as one enters the event horizon of the black hole, and the possibility that these may lead to other points within our universe or others, or even time travel. Tyson ends on noting that Herschel's son, John would be inspired by his father to continue to document the known stars as well as contributions towards photography that play on the same nature of deep time used by astronomers.

Category:Science  Duration:41:00   Series: Cosmos 2014

Hiding in the Light
Hiding in the Light 2014

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.

Category:Science  Duration:43:00   Series: Cosmos 2014

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