What happens when a large meteor crashes into the Earth? The impact of a large meteorite releases an enormous amount of energy that evaporates, melts and fractures areas surrounding the impact over distances that can range over hundreds of kilometers. Although the subject of abundant recent interest, little is directly known about the propagation of damage during these events.
Three researchers from the Hebrew University of Jerusalem have come up with a new picture of damage propagation, which explains the distinctive rock deformations generated by the high-energy shockwaves produced in these extreme conditions. These results provide new insight into meteor impact dynamics as well as dissipative mechanisms in materials subjected to sudden, extremely intense fluxes of energy. Using these results, analysis of deformed rock structures surrounding the site of an intense explosion or impact can provide a quantitative measure of its strength – even if the event occurred a billion years ago.
These findings will be published in the prestigious scientific journal Nature on Thursday, July 18, in the article, “Dynamic Fracture by Large Extraterrestrial Impacts as the Origin of Shatter Cones,” by Ph.D. candidate Amir Sagy, Physics Prof. Jay Fineberg and Geology Prof. Ze’ev Reches.
Heidi Gleit | Hebrew University
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Greenland ice flow likely to speed up: New data assert glaciers move over sediment, which gets more slippery as it gets wetter
17.08.2017 | Swansea University
Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.
As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...
Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.
Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...
For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.
While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...
An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.
The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...
A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.
Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...
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