Simply the Best Documentaries

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Lands of Gold
Peril and Promise
Expanding Universe
The Nazis, A Warning From History. Episode 5
The Incredible Human Journey: Asia
Jupiter the Giant Planet
Never Sleep Again: The Elm Street Legacy 3
Touching the Void
Unexplained Mysteries
What Happened Before The Big Bang
Rome is Burning
Harmony of the Worlds
Einsteins Nightmare
Project Nim
Urban Jungles
Cooked: Water
The Universe: 7 Wonders of the Solar System
The Insatiable Appetite
Charles Darwin and the Tree of Life
Are We All Bigots
The Birth of Israel
Art Rock
Flight of the Butterflies
The Lost Worlds of Planet Earth
Secrets of the Space Probes
A Passage to India
What is Life
1945 The Savage Peace
Chased by Sea Monsters 3of3
Is Anybody Out There
The Rise and Rise of Bitcoin
The Captains
The Farthest
Precision the Measure of All Things

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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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