Collisions in the Asteroid Belt result in the asteroids being completely destroyed and shattered into countless pieces. Computer simulations predict that most of these fragments will eventually fall into the Sun. Some of them, however, will hit the Earth after millions of years as meteorites. It is possible that this could also occur much earlier. In certain positions in the Asteroid Belt, the orbiting time of an object around the sun is a multiple of the orbit of the giant planet Jupiter. The so-called orbital resonance can lead to a disruption in the object’s orbit. It can change the orbit so much that the object would cross the Earth’s orbit and collide with the Earth. Up until today, when this might occur has only been theoretically calculated. But, a new measurement method developed by a research team at the Institute for Isotope Geology at ETH Zurich can now bring more certainty to the subject. The team has established that it could take just a few hundred thousand years for such an object to collide with our planet.
Concentrations of noble gases tell the travel time of an asteroid
Collisional fragments from asteroids in space are constantly being hit by cosmic radiation. This creates noble gases from nuclear reactions. These gases do not enter into any further chemical reactions. Therefore, during the entire duration of the radiation, i.e. the travel time of the fragment in space, they accumulate in the fragment. After measuring the concentration of these socalled cosmogenic inert gases, the travel time from original body to Earth can be calculated. The higher the concentration, the longer the meteorite was underway.
Probala Rolf | alfa
Less radiation in inner Van Allen belt than previously believed
21.03.2017 | DOE/Los Alamos National Laboratory
Mars volcano, Earth's dinosaurs went extinct about the same time
21.03.2017 | NASA/Goddard Space Flight Center
Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.
The results will be published on March 22 in the journal „Astronomy & Astrophysics“.
Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...
Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.
Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...
In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...
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22.03.2017 | Materials Sciences