Type 1A supernovae: A tiny white dwarf, left, pulls gas from its companion star. When it grows to a critical size, it is consumed in a massive thermonuclear explosion
Courtesy of Lawrence Berkeley National Laboratory
Measurements of 11 exploding stars spread throughout the visible universe made by the Hubble Space Telescope confirm an earlier, ground-based study which produced the first evidence that the universe is not only expanding, but expanding at an increasing rate.
The new study, which has been posted online [http://www.arxiv.org/abs/astro-ph/0309368] and will soon appear in the Astrophysical Journal, also provides some tantalizing new insights into the nature of the mysterious repulsive force, dubbed dark energy, that appears to be propelling this run-away expansion.
“As far as the ultimate fate of the universe goes, the most straightforward conclusion is that over the next few billion years it is going to become an increasingly thin, cold and boring place,” says Robert Knop, the assistant professor of physics and astronomy at Vanderbilt University who led the analysis of the supernova data for the Supernova Cosmology Project (SCP), an international collaboration of 48 scientists directed from Lawrence Berkeley National Laboratory in California.
David F. Salisbury | Vanderbilt University
Subaru Telescope helps pinpoint origin of ultra-high energy neutrino
16.07.2018 | National Institutes of Natural Sciences
Nano-kirigami: 'Paper-cut' provides model for 3D intelligent nanofabrication
16.07.2018 | Chinese Academy of Sciences Headquarters
For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.
To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...
For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.
Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...
Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.
A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...
Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.
"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....
Ultra-short, high-intensity X-ray flashes open the door to the foundations of chemical reactions. Free-electron lasers generate these kinds of pulses, but there is a catch: the pulses vary in duration and energy. An international research team has now presented a solution: Using a ring of 16 detectors and a circularly polarized laser beam, they can determine both factors with attosecond accuracy.
Free-electron lasers (FELs) generate extremely short and intense X-ray flashes. Researchers can use these flashes to resolve structures with diameters on the...
13.07.2018 | Event News
12.07.2018 | Event News
03.07.2018 | Event News
16.07.2018 | Physics and Astronomy
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16.07.2018 | Earth Sciences