Thursday 14 May 2015

Chemists cook up three atom-thick electronic sheets

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Making thin films out of semiconducting materials is analogous to how ice grows on a windowpane: When the

The post Chemists cook up three atom-thick electronic sheets has been published on Technology Org.

 
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Bright spots on dwarf planet Ceres

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The mysterious bright spots on the dwarf planet Ceres are better resolved in a image recently taken by NASA's Dawn spacecraft. The images were taken from a distance of 8,400 miles (13,600 kilometers).
via Science Daily
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Hubble Catches a Stellar Exodus in Action

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Astronomers have captured for the first time snapshots of fledgling white dwarf stars beginning their slow-paced, 40-million-year migration from the crowded center of an ancient star cluster to the less populated suburbs.
via Science Daily
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Researchers hone technique for finding signs of life on the Red Planet

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Astrobiologists want to improve the way unmanned Mars probes detect condensed aromatic carbon, thought to be a chemical signature of astrobiology.
via Science Daily
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Hubble Catches a Stellar Exodus in Action


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Globular star clusters are isolated star cities, home to hundreds of thousands of stars. And like the fast pace of cities, there's plenty of action in these stellar metropolises. The stars are in constant motion, orbiting around the cluster's center. Past observations have shown that the heavyweight stars live in the crowded downtown, or core, and lightweight stars reside in the less populated suburbs.


via HubbleSite NewsCenter -- Latest News Releases
http://hubblesite.org/newscenter/archive/releases/2015/16/

Left-handed cosmic magnetic field could explain missing antimatter

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The discovery of a 'left-handed' magnetic field that pervades the universe could help explain a long standing mystery -- the absence of cosmic antimatter.
via Science Daily
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(A) Missing link between prokaryotes and complex cells identified

Science Focus

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Eukaryotes—fungi, plants, us—are complex. Our large cells are characterized by their different compartments, many of which are neatly enclosed within a boundary of membrane. These compartments contain complex molecular machines that perform equally complex metabolic tasks: they degrade proteins, they splice RNA molecules, they engulf foreign bodies.

Prokaryotes, on the other hand—one celled organisms like bacteria—are simple, with a notable lack of internal membrane enclosed structures (i.e., nuclei) in their one and only cell. It has been assumed that eukaryotes must have somehow evolved from prokaryotes, but it has not been at all clear how that may have happened.

A clue came in 1977, when another branch type of prokaryotic life was discovered: archaea. They are single-celled organisms that lack nuclei and other structures, just like bacteria. But from an evolutionary standpoint, they are about as distant from bacteria as they are from eukaryotes. As soon as archaea were recognized, people started speculating that eukaryotes may have originated within the archaeal branch of life rather than the bacterial branch, or that eukaryotes and archaea might share a common ancestor.

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 » see original post http://feeds.arstechnica.com/~r/arstechnica/science/~3/N_bQ6U1_3UU/
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ORNL reports method that takes quantum sensing to new level

Science Focus

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Thermal imaging, microscopy and ultra-trace sensing could take a quantum leap with a technique developed by researchers at

The post ORNL reports method that takes quantum sensing to new level has been published on Technology Org.

 
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 » see original post http://feedproxy.google.com/~r/TechnologyOrgPhysicsNews/~3/Bx14VdloTQI/
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Dark Matter: Giver of Life (Synopsis)

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“The privilege of a lifetime is being who you are.” –Joseph Campbell

When you think about dark matter, you probably think of a few things: how mass and gravity don’t appear to line up, how there isn’t enough normal matter to account for the motions we see on scales of galaxies and up, and how it’s necessary to form the structure we see on the largest scales, from the early times of the cosmic microwave background to the cosmic web spanning billions of light years we see today.

Image credit: Tony Hallas, via http://www.qsimaging.com/gallery.html.

Image credit: Tony Hallas, via http://www.qsimaging.com/gallery.html.

But what you might not realize is that without dark matter — a substance that doesn’t interact in any (yet) measurable, non-gravitational way with anything else (or even itself) in the Universe — life as we know it would be unable to exist. The gravitation from dark matter is the only thing keeping supernova ejecta from escaping from our galaxy, and enabling heavy elements to participate in later generations of stars, planets, and biochemical reactions.

Image credit: Babak Tafreshi/Dreamview.net, via http://twanight.org/newTWAN/photos.asp?ID=3003071.

Image credit: Babak Tafreshi/Dreamview.net, via http://twanight.org/newTWAN/photos.asp?ID=3003071.

Sounds crazy, I know, but it’s true. Here’s the science behind why.



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Tadpole Nebula, Auriga Constellation Star Sticker

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tagged with: envelope sealers, star forming activity, awesome astronomy images, tnitac, tadpole nebula, auriga constellation, new born stars, hot young stars, star nursery, dust clouds, interstellar gas clouds

Galaxies, Stars and Nebulae series An awesome outer space picture featuring the Tadpole Nebula, a star forming hub located about 12000 light years away in the Auriga constellation.
This nebula is brimming with new-born stars, many as young as only a million years of age. It's called the Tadpole nebula because the masses of hot, young stars are blasting out ultraviolet radiation that has etched the gas into two tadpole-shaped pillars, called Sim 129 and130, the yellow forms that seem to be swimming away from the three red stars close to the centre of the picture.

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image code: tnitac

Image credit: NASA/JPL-Caltech/UCLA

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Dwarf Planet, Bright Spot

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Now at Ceres, Dawn's camera recorded this closer view of the dwarf planet's northern hemisphere and one of its mysterious bright spots on May 4. A sunlit portrait of a small, dark world about 950 kilometers in diameter, the image is part of a planned sequence taken from the solar-powered spacecraft's 15-day long RC3 mapping orbit at a distance of 13,600 kilometers (8,400 miles). The animated sequence shows Ceres' rotation, its north pole at the top of the frame. Imaged by Hubble in 2004 and then by Dawn as it approached Ceres in 2015, the bright spot itself is revealed to be made up of smaller spots of reflective material that could be exposed ice glinting in the sunlight. On Saturday, Dawn's ion propulsion system was turned on to spiral the spacecraft into a closer 4,350-kilometer orbit by June 6. Of course another unexplored dwarf planet, Pluto, is expecting the arrival of a visitor from Earth, the New Horizons spacecraft, by mid-July.

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The Cats Eye Nebula - Awesome Space Images Wall Decor

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tagged with: breathtaking astronomy images, star nurseries, nebulae, tcenebnch, cats eye nebula, dying star, red giant evolution, stellar evolution, stars, hubble chandra images, nasa

Galaxies, Stars and Nebulae series A gorgeous design featuring a composite image of the Cat's Eye nebula from NASA's Chandra X-ray Observatory and the Hubble Space Telescope.
This famous nebula represents a phase of stellar evolution after a star like our Sun runs out of fuel. In this phase, a star becomes an expanding red giant and sheds some of its outer layers, eventually leaving behind a hot core that collapses to form a dense white dwarf star. A fast wind emanating from the hot core rams into the ejected atmosphere, pushes it outward, and creates the graceful filamentary structures.
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image code: tcenebnch

Image credit: NASA/Chandra www.nasa.gov

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Star birth in Carina Nebula from Hubble's WFC3 det Case For The iPad Mini

Here's a great iPad case from Zazzle featuring a Hubble-related design. Maybe you'd like to see your name on it? Click to personalize and see what it's like!


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ImageID: 42-23286264 / STScI / NASA/Corbis / Star birth in Carina Nebula from Hubble's WFC3 detector

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Two-Dimensional Semiconductor Comes Clean

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In 2013 James Hone, Wang Fong-Jen Professor of Mechanical Engineering at Columbia Engineering, and colleagues at Columbia demonstrated

The post Two-Dimensional Semiconductor Comes Clean has been published on Technology Org.

 
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Orion Nebula and Trapezium Stars Star Sticker

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tagged with: envelope sealers, ornebcsfr, awesome astronomy images, orion nebula, emission nebula, trapezium stars, emission nebulae, hot young stars, star nursery, new born stars, dust clouds

Galaxies, Stars and Nebulae series A gorgeous picture from the deep universe featuring the bubbling, seething mass of gas and dust that is the Orion Nebula, 1500 light years away and the closest star-forming region to us. The nebula is a star nursery in which there are birthing, new-born, young and adult stars. Look carefully in the brightest central region and you'll see the Trapezium, four of the most massive stars in Orion.

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Image credit: NASA, ESA, M. Robberto (Space Telescope Science Institute/ESA) and the Hubble Space Telescope Orion Treasury Project Team

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The Hubble Space Telescope iPad Mini Cover

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The Hubble Space Telescope

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