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Monkey Kingdom
Montezuma
Is Gun Crime a Virus
Archimedes Secret
Prescription Thugs
Life of a Universe Creation
American Serengeti
Operation Stonehenge
Egypt on the Brink
Lord of Asia
Climbing Everest with a Mountain on My Back
Meditation Can It Change You
Japan at War
Once Upon a Time
Citizenfour
One Life on the Limit
Florence and the Uffizi Gallery
Ballet 422
Lack of Humility
Fire Ants The Invincible Army
What is the World Made of
Can We Have Unlimited Power
The Coldest War
Deep Sea
In the Footsteps of Alexander the Great: Son of God
The Moon
Magnificent Desolation Walking on the Moon
Journey to Space
A.I. and the Destiny of Mankind
Space Station
The Ming
Why are Thin People not Fat
Absolute Zero Conquest of Cold
Apeman - Spaceman
Spiral of Terror
The True Cost

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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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