A new analysis of the mineral composition of meteorites suggests that theories concerning the development of the early solar system may need revision. Announcing their results today in the journal Science, researchers conclude that it took the earth only 20 million years to form from material floating around the early sun. Previous estimates, in contrast, had placed that figure at around 50 million years. The findings also re-open the debate over which types of supernovae could have produced our solar system.
Measuring the amounts of an isotope of the element niobium (niobium-92) and its daughter isotope zirconium-92 in two meteorite samples provided the researchers with a kind of radioactive chronometer capable of estimating the timing of events in the early solar system. The earlier calculation of 50 million years for the formation of the earth was obtained using the same technique. But this time, the experimenters made sure to avoid contamination of their samples. By paying greater attention to maintaining the purity of the samples, says study co-author Brigitte Zanda-Hewins of Rutgers University, the team was able to produce a more accurate estimate. Additionally, the new, lower figures for the abundance of niobium-92 (which is generated by supernovae) in the early solar system, Zanda-Hewins says, loosen the constraints on the types of supernovae that could have spawned the solar system. The floor is once again open for candidates
Greg Mone | Scientific American
OU-led team discovers rare, newborn tri-star system using ALMA
27.10.2016 | University of Oklahoma
First results of NSTX-U research operations
26.10.2016 | DOE/Princeton Plasma Physics Laboratory
Ultrafast lasers have introduced new possibilities in engraving ultrafine structures, and scientists are now also investigating how to use them to etch microstructures into thin glass. There are possible applications in analytics (lab on a chip) and especially in electronics and the consumer sector, where great interest has been shown.
This new method was born of a surprising phenomenon: irradiating glass in a particular way with an ultrafast laser has the effect of making the glass up to a...
Terahertz excitation of selected crystal vibrations leads to an effective magnetic field that drives coherent spin motion
Controlling functional properties by light is one of the grand goals in modern condensed matter physics and materials science. A new study now demonstrates how...
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.
"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
27.10.2016 | Materials Sciences
27.10.2016 | Physics and Astronomy
27.10.2016 | Life Sciences