DES AILES POUR LA SCIENCE - CHILI, L'OR BLEU VENU DU CIEL

Au nord de Santiago, la capitale chilienne, les deux aventuriers Clémentine et Adrien nous font découvrir les dispositifs qui permettent aux paysans de cette région aride de récolter de l'eau douce pour cultiver leurs terres.

Pour en savoir plus

Réalisation : Clémentine Bacri, Adrien Normier, Samy El Hourch
Production : Universcience, Gédéon Programmes, CNDP, ORA 2013
Durée : 7 min 54 s
Année de production : 2013
Date de diffusion : 27/09/2013

N°196

Semaine du 27 au 03 oct. 2013

http://www.universcience.tv/video-des-ailes-pour-la-science-chili-l-or-bleu-venu-du-ciel-5832.html

La carte du ciel

(via fuckyeahcartography)

Posted on September 28, 2013 via My Imaginary Brooklyn

Source: myimaginarybrooklyn

http://scientificillustration.tumblr.com/post/62508021625

The Daring Bolt

"The long exposure image captured a strong thunder meanwhile the moon appears between the clouds." - Carlo Murenu

1 HOUR AGO

POSTED BY KENOBI-WAN-OBI

http://kenobi-wan-obi.tumblr.com/post/62495297260/the-daring-bolt-the-long-exposure-image

Why is the sky blue?

It is easy to see that the sky is blue. Have you ever wondered why? A lot of other smart people have, too. And it took a long time to figure it out!

The light from the Sun looks white. But it is really made up of all the colors of the rainbow.

A prism is a specially shaped crystal. When white light shines through a prism, the light is separated into all its colors.

The light from the Sun looks white. But it is really made up of all the colors of the rainbow.

If you visited The Land of the Magic Windows, you learned that the light you see is just one tiny bit of all the kinds of light energy beaming around the Universe--and around you!

Like energy passing through the ocean, light energy travels in waves, too. Some light travels in short, "choppy" waves. Other light travels in long, lazy waves. Bluelight waves are shorter than red light waves.

All light travels in a straight line unless something gets in the way to—

• reflect it (like a mirror)
• bend it (like a prism)
• or scatter it (like molecules of the gases in the atmosphere)

Sunlight reaches Earth's atmosphere and is scattered in all directions by all the gases and particles in the air. Blue light is scattered in all directions by the tiny molecules of air in Earth's atmosphere. Blue is scattered more than other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time.

Closer to the horizon, the sky fades to a lighter blue or white. The sunlight reaching us from low in the sky has passed through even more air than the sunlight reaching us from overhead. As the sunlight has passed through all this air, the air molecules have scattered and rescattered the blue light many times in many directions. Also, the surface of Earth has reflected and scattered the light. All this scattering mixes the colors together again so we see more white and less blue.

What Makes a Red Sunset?

As the Sun gets lower in the sky, its light is passing through more of the atmosphere to reach you. Even more of the blue light is scattered, allowing the reds and yellows to pass straight through to your eyes.

Sometimes the whole western sky seems to glow. The sky appears red because larger particles of dust, pollution, and water vapor in the atmosphere reflect and scatter more of the reds and yellows.

http://spaceplace.nasa.gov/blue-sky/

How to identify that light in the sky ?

http://ilovecharts.tumblr.com/post/58186766696/astronomy-101

Un monde Vue du ciel : La fin du pétrole

Des gisements pétroliers des Etat-Unis aux paysages menacés de Chine,Yann Arthus-Bertrand nous emmène dans un tour du monde poignant.Des images sublimes et parfois dramatiques dénoncent comment l'Homme a détruit ce que la Terre à mis des millions d'années à façonner.Plus que jamais, le défi de l'Homme moderne consiste à concilier son mode de vie et la préservation de la planète!

L'histoire d'une fabuleuse matière qui a changé nos vies et qui est en train de disparaître. Parce que demain il faudra vivre sans pétrole,Yann Arthus-Bertrand essaie de comprendre quelles seront les conséquences de cet épuisement des ressources et quelles sont les solutions d'énergies renouvelable possibles (Etats-Unis, Chine, Bénin, Canada, Belgique)

Avec"Vu du ciel",Yann Arthus-Bertrand présente un état des lieux de la planète à la fois magnifique et menacée,pour nous faire rêver,nous informer,et nous proposer des solutions.

Écrit par Administrator 


La Terre du Futur

Mercredi, 04 Avril 2012 00:00

http://www.laterredufutur.com/accueil/index.php/monde-futur/269-un-monde-vue-du-ciel-la-fin-du-petrole.html

Stunning Timelapse Video of Earth and Sky, Volume 2

Landscapes: Volume Two from Dustin Farrell on Vimeo.

Almost a year ago we featured a timelapse video by videographer Dustin Farrell that showed the beauty of our Earth and sky. He’s now completed a second video which is just absolutely beautiful. Of particular interest to Universe Today readers is how Farrell was able to capture the stunning shimmering of stars at night and he even got several long-trailing meteors to make a cameo. Farrell says every frame of this video is a raw still from a Canon 5D2 DSLR and processed with Adobe software. “In Volume 2 I again show off my beautiful home state of Arizona and I also made several trips to Utah,” he writes on his Vimeo page. “This video has some iconic landmarks that we have seen before. I felt that showing them again with motion controlled HDR and/or night timelapse would be a new way to see old landmarks.

by Nancy Atkinson on October 7, 2011

http://www.universetoday.com/89636/stunning-timelapse-video-of-earth-and-sky-volume-2/