Venus 101 | National Geographic

Named after the ancient Roman goddess of beauty, Venus is known for its exceptional brightness. Find out about the volcanoes that dot Venus’s surface, the storms that rage in its atmosphere, and the surprising feature that makes Venus outshine every planet or star in the night sky.
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Venus 101 | National Geographic
https://youtu.be/BvXa1n9fjow

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National Geographic: Drain the Bermuda Triangle

In this special, National Geographic Channel explores the Bermuda Triangle’s ominous reputation by draining the water from it to see what exactly lies below the surface of the mythical triangle. With the aid of data from sophisticated sonar surveys, see what the ocean floor looks like below the Bermuda Triangle.
Channel: Documentary Zone
Published: 2014-12-17 17:28:51
Duration: 43M59S
Views: 2264644
Likes: 11120
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Why Mars Died, and Earth Lived

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The Mars rover, Curiosity, is the latest in a long line of missions to Mars: landers sent to scoop its soil and study its rocks, orbiters sent to map its valleys and ridges.

They are all asking the same question. Did liquid water once flow on this dry and dusty world? Did it support life in any form? And are there remnants left to find? The science that comes out of these missions may help answer a much larger, more philosophical question.

Is our planet Earth the norm, in a galaxy run through with life-bearing planets? Or is Earth a rare gem, with a unique make-up and history that allowed it to give rise to living things? On Mars, Curiosity has spotted pebbles and other rocks commonly associated with flowing water.

It found them down stream on what appears to be an ancient river fan, where water flowed down into Gale Crater. This shows that at some point in the past, Mars had an atmosphere, cloudy skies, and liquid water flowing. So what could have turned it into the desolate world we know today?

One process that very likely played a role goes by the unscientific name, “sputtering.” Like the other planets in our solar system, Mars is lashed by high-energy photons from the Sun. When one of these photons enters the atmosphere of a planet, it can crash into a molecule, knocking loose an electron and turning it into an ion. The solar wind brings something else: a giant magnetic field. When part of the field grazes the planet, it can attract ions and launch them out into space.

Another part might fling ions right into the atmosphere at up to a thousand kilometers per second. The ions crash into other molecules, sending them in all directions like balls in a game of pool. Over billions of years, this process could have literally stripped Mars of its atmosphere, especially in the early life of the solar system when the solar wind was more intense than it is today.

Sputtering has actually been spotted directly on another dead planet, Venus. The Venus Express mission found that solar winds are steadily stripping off lighter molecules of hydrogen and oxygen. They escape the planet on the night side… then ride solar breezes on out into space.

This process has left Venus with an atmosphere dominated by carbon dioxide gas… a heat trapping compound that has helped send surface temperatures up to around 400 degrees Celsius. The loss of Venus’ atmosphere likely took place over millions of years, especially during solar outbursts known as coronal mass ejections.

If these massive blast waves stripped Venus and Mars of an atmosphere capable of supporting life how did Earth avoid the same grim fate? We can see the answer as the solar storm approaches earth. Our planet has what Mars and Venus lack – a powerful magnetic field generated deep within its core.

This protective shield deflects many of the high-energy particles launched by the Sun. In fact, that’s just our first line of defense. Much of the solar energy that gets through is reflected back to space by clouds, ice, and snow.

The energy that earth absorbs is just enough to power a remarkable planetary engine: the climate. It’s set in motion by the uneveness of solar heating, due in part to the cycles of day and night, and the seasons. That causes warm, tropical winds to blow toward the poles, and cold polar air toward the equator.

Wind currents drive surface ocean currents. This computer simulation shows the Gulf Stream winding its way along the coast of North America. This great ocean river carries enough heat energy to power the industrial world a hundred times over.

It breaks down in massive whirlpools that spread warm tropical waters over northern seas. Below the surface, they mix with cold deep currents that swirl around undersea ledges and mountains. Earth’s climate engine has countless moving parts: tides and terrain, cross winds and currents — all working to equalize temperatures around the globe.

Over time, earth developed a carbon cycle and an effective means of regulating green house gases. In our galaxy, are still-born worlds like Mars the norm? Or in Earth, has Nature crafted a prototype for its greatest experiment… Life?

Channel: SpaceRip
Published: 2012-10-13 14:24:31
Duration: 9M32S
Views: 4955583
Likes: 34500
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Former CIA Chief Explains How Spies Use Disguises | WIRED

Former Chief of Disguise for the CIA, Jonna Mendez, explains how disguises are used in the CIA, and what aspects to the deception make for an effective disguise.

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Former CIA Chief Explains How Spies Use Disguises | WIRED

Channel: WIRED
Published: 2018-10-22 13:41:16
Duration: 9M25S
Views: 2099907
Likes: 79746
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5 Strange Creatures Found Frozen in Ice

When an animal becomes frozen in ice, it’s body can last for thousands of years, giving us an incredible view of what the world was like when the animal was alive. Prehistoric mammoths, woolly rhinos, and even humans have been discovered, and are almost perfectly preserved, encased in their tomb of ice. But sometimes, more mysterious things are uncovered that seem to challenge parts of our understanding of biology.

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Sources:
https://blogs.scientificamerican.com/tetrapod-zoology/the-strange-case-of-the-minnesota-iceman/
https://blogs.scientificamerican.com/tetrapod-zoology/a-review-of-neanderthal-the-strange-saga-of-the-minnesota-iceman-part-1/
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https://en.wikipedia.org/wiki/Siberian_Ice_Maiden
http://siberiantimes.com/culture/others/features/siberian-princess-reveals-her-2500-year-old-tattoos/
http://siberiantimes.com/science/casestudy/features/iconic-2500-year-old-siberian-princess-died-from-breast-cancer-reveals-unique-mri-scan/
https://en.wikipedia.org/wiki/Lyuba
http://www.smh.com.au/technology/sci-tech/meet-lyuba-the-baby-mammoth-who-came-in-from-the-cold-20171117-gznbbj.html
http://www.dailymail.co.uk/sciencetech/article-2634954/The-tragic-tale-Lyuba-Baby-mammoth-choked-death-mud-hole-42-000-years-ago.html
http://www.bbc.co.uk/news/science-environment-27477167
http://www.sciencedirect.com/science/article/pii/S1040618211003132?via%3Dihub
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http://www.crystalinks.com/otzi.html
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https://www.sciencedaily.com/releases/2013/06/130610084123.htm
http://www.bbc.co.uk/news/science-environment-171913

Channel: Ben G Thomas
Published: 2018-01-14 16:49:48
Duration: 17M46S
Views: 4824736
Likes: 42628
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Saturn 101 | National Geographic

How did the rings around Saturn form? How many moons does the planet have? See stunning NASA images of the gas giant studied by Christian Huygens and Giovanni Cassini.
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About National Geographic:
National Geographic is the world’s premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of what’s possible.

Get More National Geographic:
Official Site: http://bit.ly/NatGeoOfficialSite
Facebook: http://bit.ly/FBNatGeo
Twitter: http://bit.ly/NatGeoTwitter
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Saturn 101 | National Geographic
https://youtu.be/epZdZaEQhS0

National Geographic
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Channel: National Geographic
Published: 2017-09-13 16:20:14
Duration: 4M7S
Views: 335680
Likes: 4353
Favorites: 0

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