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The Daily Cosmos

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The Daily Cosmos

Cosmology
Astrophysics
Astronomy

Location: #science
Members: 55
Latest Activity: on Monday

 

Cosmology - Astrophysics - Astronomy

 

Hubble Wallpaper - Awesome Hubble Images

Starts With A Bang

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Comment by Mrs.B on Monday

Well I guess that was built to last.

Excellent pics.

Comment by Stephen on Monday

"Jupiter with Io and Europa

Here we have a really nice image of
Jupiter with two of its moons, Io and Europa. The really fascinating thing about this image however is, that it was taken over 37 years ago, February 13th, 1979, by the Voyager 1 space probe.

Built to last 5 years, the spacecraft is in interstellar space today and still operating almost 39 years after its launch on September 5th, 1977. Voyager 1 passed Jupiter on March 5th, 1979, and Saturn on November 12th, 1980. It’s current velocity is about 38,000 miles per hour."

Photo

Animated photo

Comment by Mrs.B on Monday

Looks like a scalded orange.

Comment by Stephen on Monday

December 3rd full disk image of the Sun

In this image taken by +Paul Stewart on December 3rd, 2016, you can see our Sun, imaged through a Hydrogen alpha filter (https://goo.gl/pvfxvf), with some small solar prominences extending outward.

Also visible are some dark filaments and bright plages. Read more on solar astronomy here:
http://www.skyandtelescope.com/observing/guide-to-observing-the-sun-in-h-alpha092321050923/

Photo

Comment by Stephen on Sunday

Theory challenging Einstein's view on speed of light could soon be tested

The newborn universe may have glowed with light beams moving much faster than they do today, according to a theory that overturns Einstein’s century-old claim that the speed of light is a constant.

João Magueijo, of Imperial College London, and Niayesh Afshordi, of the University of Waterloo in Canada, propose that light tore along at infinite speed at the birth of the universe when the temperature of the cosmos was a staggering ten thousand trillion trillion celsius.

It is a theory Magueijo has being developing since the late 1990s, but in a paper published on Monday he and Afshordi describe for the first time how scientists can finally test the controversial idea. If right, the theory would leave a signature on the ancient radiation left over from the big bang, the so-called cosmic microwave background that cosmologists have observed with satellites.

“We can say what the fluctuations in the early universe would have looked like, and these are the fluctuations that grow to form planets, stars and galaxies,” Afshordi told the Guardian.

The speed of light in a vacuum is considered to be one of the fundamental constants of nature. Thanks to Einstein’s theory of general relativity, it was stamped in the annals of physics more than a century ago at about 1bn km/h. But while general relativity is one of the cornerstones of modern physics, scientists know that the rules of today did not hold at the birth of the universe.

Thanks to Einstein’s theory of general relativity, the speed of light in a vacuum is considered to be one of the fundamental constants of nature. Photograph: Hulton Archive/Getty Images

Magueijo and Afshordi came up with their theory to explain why the cosmos looks much the same over vast distances. To be so uniform, light rays must have reached every corner of the cosmos, otherwise some regions would be cooler and more dense than others. But even moving at 1bn km/h, light was not travelling fast enough to spread so far and even out the universe’s temperature differences.

To overcome the conundrum, cosmologists including Stephen Hawking have proposed a theory called inflation, in which the fledgling universe underwent the briefest spell of the most tremendous expansion.

Read more= read:https://www.theguardian.com/science/2016/nov/28/theory-challenging-...

Comment by Mrs.B on Sunday

Well that can't be good.

Comment by Stephen on Sunday

(iStock)

(iStock)

Too much space travel is hazardous for your eyeballs

Something strange has been happening to people who stay too long in space: The backs of their eyeballs start to flatten. Spider-web-like marks called choroidal folds crisscross the thin layer of blood vessels and connective tissue that surround their retinas. Their vision goes blurry, their optic nerves become inflamed. The damage can last long after the astronauts return to Earth. And scientists haven't been able to explain why.

“People initially didn't know what to make of it, and by 2010 there was growing concern as it became apparent that some of the astronauts had severe structural changes that were not fully reversible upon return to earth,” notes Noam Alperin, a professor of radiology and biomedical engineering at the University of Miami Miller School of Medicine.

Now Alperin may have found the source of this mysterious syndrome. In a study presented this week at the annual meeting of the Radiological Society of North America, he suggests that the problem might be caused by pressure from the fluid that cushions the brain.

Read more=  read:https://www.washingtonpost.com/news/speaking-of-science/wp/2016/11/...

Comment by Stephen on Saturday

LONDON & PARIS FROM THE ISS

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Comment by Chris on December 1, 2016 at 11:26pm
Comment by Chris on December 1, 2016 at 11:25pm

It looks like light pollution to me.

Earth at Night
 
 
 

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