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Simply the Best Documentaries

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Facing Ali
Clash of the Gods: Medusa
Journeys in Space and Time
The Science of Doctor Who
The Gatekeepers
Battle for the Himalayas: The Fight to Film Everest
Man on Mars Mission to the Red Planet
Meditation Can It Change You
Journey to the Edge of the Universe
Project Nim
Saturn Lord of the Rings
Land Of The Mammoth
Beyond the Rainbow
Kingdom of the Blue Whale
How to Grow a Planet Life from Light
Climate Change: A Horizon Guide
Living Together
Planet Dinosaur Ultimate Killers
Shine a Light 2of2
Johnson Nixon and Vietnam: Reversal Of Fortune
Addicted to Sexting
Harmony of the Worlds
Volcano
Flying Monsters
Is your Brain Male or Female
When Will Time End
Polar Bears: A Summer Odyssey
The Story of Maths To Infinity and Beyond
Inside the Milky Way
Deep Sea
Ghosts of the Abyss
Building the Sun The 250 Million Degree Problem
The 21st Century Race for Space
Deliver Us From Evil
Tiny Giants
Strange Signals from Outer Space

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Unafraid of the Dark
Unafraid of the Dark 2014

Tyson describes the discovery of cosmic rays by Victor Hess through high-altitude balloon trips. Swiss Astronomer Fritz Zwicky, in studying supernovae, postulated that these cosmic rays originated from these events instead of electromagnetic radiation. Also tells how Vera Rubin observed that the rotation of stars at the edges of observable galaxies did not follow expected rotational behavior leading to consider the existence of dark matter. This further led to the discovery of dark energy to account for the increasing rate of expansion of the universe. Tyson then describes the interstellar travel of the two Voyager probes. Tyson tells the Carl Sagan's role in the Voyager program, including creating the Voyager Golden Record to encapsulate humanity and Earth's position in the universe. Tyson concludes the series by emphasizing Sagan's message on the human condition in the vastness of the cosmos, and to encourage viewers to continue to explore and discover what else the universe has to offer.

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

 
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