The very first stars that formed early in the history of the universe were smaller than the massive giants implied by the results of a NASA research satellite, but still larger than the typical stars found in our galaxy today, according to a research team led by the University of Chicagos Jason Tumlinson.
"We have managed to reconcile within a single theory the two very different leading indicators of the nature of the first stars," said Tumlinson, the Edwin Hubble Scientist in Astronomy & Astrophysics at the University of Chicago. Tumlinson will present the theory June 1 at the American Astronomical Society meeting in Denver. His co-authors are the University of Colorados Aparna Venkatesan and J. Michael Shull.
No telescope is powerful enough yet to see the first stars, but astronomers can guess at their existence based on the stellar clues they leave behind. In 2001 and 2002, NASAs Wilkinson Microwave Anistropy Probe (WMAP) looked at the oldest light in the universe left over from the big bang, the cosmic microwave background, and found one such clue in the form of ionized (electrically charged) gas floating between the galaxies. WMAP showed that this intergalactic gas was ionized approximately 200 million years after the big bang.
Steve Koppes | EurekAlert!
Seeing the quantum future... literally
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Airborne thermometer to measure Arctic temperatures
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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