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Project Nim
The Art of Persuasion
Born to Be Wild
The Lost Tribes of Humanity
Nascar The IMAX Experience
Dinosaurs Alive
Escaping ISIS
The Nazis, A Warning From History. Episode 1
Clash of the Gods: Odysseus I
Becoming Human: First Steps
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Dark Net Rewire
Sex in Space
Behind Closed Doors
Deep Earth
The Normans: Normans of the South
Vegan 2017 The Film
Messengers
The Most Dangerous Band in the World. The Story of Guns N Roses
The Arctic
Bear Necessities
Lo and Behold Reveries of the Connected World
The Death of the Oceans
Life: Challenges of Life
Solving the Secrets
WWII In 3D
Giants
The 21st Century Race for Space
Virunga
Jacques-Louis David
Reagan Gorbachev and Third World: Rise Of The Right
Putins Way
Bugs a Rainforest Adventure
Daft Punk Unchained
The Cities
Earth, the Power of the Planet: Atmosphere

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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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