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S. John
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Arrivederci Venere! Queste sono le ultime sere dell'anno per ammirare il luminoso pianeta dopo il tramonto.
Era diventata una presenza quasi abituale, ed in fondo Venere ha salutato la fine delle nostre giornate per quasi tre stagioni, dallo scorso estate e per tutto l'autunno e l'inverno. Ora che la primavera è imminente ci saluta e cambia orizzonte ed orario. È già molto bassa sull'orizzonte ma nel corso dei prossimi giorni la vedremo rapidamente avvicinarsi - ovviamente solo prospetticamente - al Sole, sera dopo sera sarà sempre più vicina alla luce del giorno e a fine Marzo riguardando ad OVEST non vedremo più la sua intensa luce. La ritroveremo per tutto il resto dell'anno ad EST, ma al mattino presto, prima dell'alba.
Da Vespero (stella della sera) diventerà Lucifero (stella del mattino)
Saluterà dunque l'inizio e non la fine delle nostre giornate!

Crediti foto: Robert Breckenridge

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How do you measure the universe--or how fast it's expanding? A group of astronomers from the H0LiCOW collaboration have an idea. Get the details:

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A simple chemistry method designed specifically to analyze for amino acids, the structural building blocks of all life on Earth, could vastly enhance how scientists search for signs of life on other planets. Details:

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The Big Blue | International Space Station
ESA Astronaut Thomas Pesquet: "Le grand bleu: Our planet is mostly blue and white, but you can’t even get tired of looking at the sea and the clouds from above."

"D’ici on voit surtout le bleu des océans et le blanc des nuages, mais c’est une vue dont on ne peut pas se lasser!"

Learn about ESA Astronaut Thomas Pesquet of France:

Find out more about the Proxima mission:

Credit: ESA/NASA
Image Date: December 1, 2016

+Thomas Pesquet 
+European Space Agency, ESA 
+NASA Johnson Space Center 
+NASA's Earth Observatory 

#NASA #Space #ISS #Earth #Ocean #Water #Planet #BluePlanet #Astronaut #ThomasPesquet #ESA #Europe #France #CNES
#Proxima #Spacecraft #Technology #Engineering #Expedition50 #OverviewEffect #OrbitalPerspective #STEM #Education #JourneyToMars

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Fossils of what may be the earliest four-legged backboned animals to walk on land have been discovered in Scotland.
The lizard-like creatures lived about 355 million years ago, when the ancestors of modern reptiles, birds and mammals emerged from swamps.

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Fluorite | #Geology #GeologyPage #Mineral

Locality: Denton Mine, Goose Creek Mine Group, Harris Creek Sub-District, Illinois-Kentucky Fluorspar Dist., Hardin Co., Illinois, USA

Measurements: 12.0 x 8.13 x 9.7 cm

Photo Copyright © Heritage Auctions

Geology Page

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Global warming is beyond the “point of no return”, according to the lead scientist behind a ground-breaking climate change study.

The full impact of climate change has been underestimated because scientists haven't taken into account a major source of carbon in the environment.

Dr Thomas Crowther’s report has concluded that carbon emitted from soil was speeding up global warming.

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Dust and Gas in the Milky Way's Center | NASA
Judy: "Centered on the invisible black hole called Sagittarius A*, infrared light from the Spitzer and WISE missions provides us a glimpse into what otherwise appears visually as a dark band in the constellation of Sagittarius. As you can see, it's a busy place bustling with star formation evidenced by glowing nebulas."

"Because there is no separation between nearer and more distant structures, it's quite confusing. Imagine taking an x-ray of your body looking down from the top of your head with all your bones together on a single, flat plane. We can guess that larger structures are generally closer to us and the smaller ones are generally farther in the distance, but it's not always true, so it's best to take any interpretations about spatial positioning with a grain of salt. We know with our skeletal x-ray that our teeth are attached to our skull, but we don't have that advantage with our infrared view of the galaxy."

"Still, it is tempting to make some general observations. Notice that there seems to be a lot of grayish-colored dust and gas sweeping outward from the center to the right side of the frame. Are we looking at the central part of an arm of our galaxy sweeping outward and toward us? Is the left side of the image the opposing arm receding in the other direction? Maybe. It does seem like some maps illustrating the Milky Way match up with this guess."

Technical details: "One of the challenges of combining Spitzer and WISE data is that WISE imagery is at a much lower resolution. This causes some unsightly green glows around many of the stars. To deal with it this time I used a combination of a "Minimum" filter applied to the greenest areas. What this does is kind of shrink the spread of the star so it's more contained. Later on I also applied a channel mixer on some remaining green halos to nearly eliminate the glow. I think it worked really well without compromising the image quality in other ways too much."

Nov. 25, 2016: "I updated this image. Improvements should only be visible at around 100% zoom on the full size image. Overall image from lower zoom levels wasn't affected much.

Credit: Judy Schmidt
Release Date: November 24, 2016

+Spitzer Space Telescope 
+NASA Jet Propulsion Laboratory 

#NASA #Astronomy #Space #Science #Nebula #MilkyWay #Galaxy #SagittariusA #Cosmos #Universe #Spitzer #Infrared #WISE
#Telescope #JPL #Caltech #Pasadena #California #USA

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Quartz with Dumortierite Inclusions | #Geology #GeologyPage #Mineral

Photo Copyright © Jeff Scovil

Geology Page
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