This end only comes to the heavies of the neighborhood, those that weigh 30 times as much as our sun or more. When it happens, their dazzling light can be seen at much greater distances than before the event. Thus, early observers of the heavens saw bright points of light appear in the sky where none had existed the night before, and they dubbed them "supernova" or "new stars."
Until now, scientists had only been able to spot supernovae several days after stars in the process of exploding had begun to brighten. But the scientists who investigate this phenomenon needed to be able to observe what happens to these stars in real time. That's precisely what NASA scientists have managed to do for the first time, and their achievement has confirmed theoretical research carried out by Prof. Eli Waxman of the Weizmann Institute's Department of Condensed Matter Physics.
Aided by NASA's advanced research satellite, Swift, the scientists succeeded in detecting a supernova just 160 seconds after the event began. Seeing the supernova so early allowed the scientists to observe, in addition to the material being expelled in all directions, jets of gamma rays and x rays shooting out from the vicinity of the explosion.
This confirmed the theory that supernovas are the source of gamma ray bursts that have been measured in the past. They also found that the star was composed mainly of oxygen and carbon, signs that the star was, indeed, very heavy. For the first time, scientists were able to identify shock waves that give rise to the gamma and x-ray radiation emanating from the center of the star and moving toward the surface. These findings have bolstered the theoretical model of such supernova explosions proposed by Waxman several years ago.
Jennifer Manning | EurekAlert!
Seeing the quantum future... literally
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Airborne thermometer to measure Arctic temperatures
11.01.2017 | Moscow Institute of Physics and Technology
Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.
As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...
At TU Wien, an alternative for resource intensive formwork for the construction of concrete domes was developed. It is now used in a test dome for the Austrian Federal Railways Infrastructure (ÖBB Infrastruktur).
Concrete shells are efficient structures, but not very resource efficient. The formwork for the construction of concrete domes alone requires a high amount of...
Many pathogens use certain sugar compounds from their host to help conceal themselves against the immune system. Scientists at the University of Bonn have now, in cooperation with researchers at the University of York in the United Kingdom, analyzed the dynamics of a bacterial molecule that is involved in this process. They demonstrate that the protein grabs onto the sugar molecule with a Pac Man-like chewing motion and holds it until it can be used. Their results could help design therapeutics that could make the protein poorer at grabbing and holding and hence compromise the pathogen in the host. The study has now been published in “Biophysical Journal”.
The cells of the mouth, nose and intestinal mucosa produce large quantities of a chemical called sialic acid. Many bacteria possess a special transport system...
UMD, NOAA collaboration demonstrates suitability of in-orbit datasets for weather satellite calibration
"Traffic and weather, together on the hour!" blasts your local radio station, while your smartphone knows the weather halfway across the world. A network of...
Fiber-reinforced plastics (FRP) are frequently used in the aeronautic and automobile industry. However, the repair of workpieces made of these composite materials is often less profitable than exchanging the part. In order to increase the lifetime of FRP parts and to make them more eco-efficient, the Laser Zentrum Hannover e.V. (LZH) and the Apodius GmbH want to combine a new measuring device for fiber layer orientation with an innovative laser-based repair process.
Defects in FRP pieces may be production or operation-related. Whether or not repair is cost-effective depends on the geometry of the defective area, the tools...
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16.01.2017 | Power and Electrical Engineering