Heck and his colleagues examined 22 interstellar grains from the Murchison meteorite for their analysis. Dying sun-like stars flung the Murchison grains into space more than 4.5 billion years ago, before the birth of the solar system. Scientists know the grains formed outside the solar system because of their exotic composition.
“The concentration of neon, produced during cosmic-ray irradiation, allows us to determine the time a grain has spent in interstellar space,” Heck said. His team determined that 17 of the grains spent somewhere between three million and 200 million years in interstellar space, far less than the theoretical estimates of approximately 500 million years. Only three grains met interstellar duration expectations (two grains yielded no reliable age).
“The knowledge of this lifetime is essential for an improved understanding of interstellar processes, and to better constrain the timing of formation processes of the solar system,” Heck said. A period of intense star formation that preceded the sun’s birth may have produced large quantities of dust, thus accounting for the timing discrepancy, according to the research team.
Citation: “Interstellar Residence Times of Presolar Dust Grains from the Murchison Carbonaceous Meteorite,” Astrophysical Journal, June 20, 2009, Vol. 698, Issue 12, pages 1155-1164
Authors: Philipp R. Heck, University of Chicago Department of Geophysical Sciences and Chicago Center for Cosmochemistry
Frank Gyngard, Laboratory for Space Sciences and Physics Department, Washington University, St. Louis
Ulrich Ott, Max Planck Institute for Chemistry, Mainz, Germany
Matthias M.M. Meier, Institute of Isotope Geology and Mineral Resources, Zurich, Switzerland
Janaína N. Ávila, Research School of Earth Sciences and Planetary Science Institute, Australian National University, Canberra
Sachiko Amari, Laboratory for Space Sciences and Physics Department, Washington University, St. Louis
Ernest K. Zinner, Laboratory for Space Sciences and Physics Department, Washington University, St. Louis
Roy S. Lewis, Enrico Fermi Institute and the Chicago Center for Cosmochemistry, University of Chicago
Heinrich Baur, Institute of Isotope Geology and Mineral Resources, Zurich, Switzerland
Rainer Wieler, Institute of Isotope Geology and Mineral Resources, Zurich, Switzerland
Funding sources: National Aeronautics and Space Administration, Swiss National Science Foundation, the Australian National University, and the Brazilian National Council for Scientific and Technological Development
Scientific Contact: Philipp Heck 312-860-8656 firstname.lastname@example.org
Steve Koppes | Newswise Science News
Astronomers release most complete ultraviolet-light survey of nearby galaxies
18.05.2018 | NASA/Goddard Space Flight Center
A quantum entanglement between two physically separated ultra-cold atomic clouds
17.05.2018 | University of the Basque Country
So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics
Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...
The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...
A team led by Austrian experimental physicist Rainer Blatt has succeeded in characterizing the quantum entanglement of two spatially separated atoms by observing their light emission. This fundamental demonstration could lead to the development of highly sensitive optical gradiometers for the precise measurement of the gravitational field or the earth's magnetic field.
The age of quantum technology has long been heralded. Decades of research into the quantum world have led to the development of methods that make it possible...
Cardiovascular tissue engineering aims to treat heart disease with prostheses that grow and regenerate. Now, researchers from the University of Zurich, the Technical University Eindhoven and the Charité Berlin have successfully implanted regenerative heart valves, designed with the aid of computer simulations, into sheep for the first time.
Producing living tissue or organs based on human cells is one of the main research fields in regenerative medicine. Tissue engineering, which involves growing...
A team of scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg investigated optically-induced superconductivity in the alkali-doped fulleride K3C60under high external pressures. This study allowed, on one hand, to uniquely assess the nature of the transient state as a superconducting phase. In addition, it unveiled the possibility to induce superconductivity in K3C60 at temperatures far above the -170 degrees Celsius hypothesized previously, and rather all the way to room temperature. The paper by Cantaluppi et al has been published in Nature Physics.
Unlike ordinary metals, superconductors have the unique capability of transporting electrical currents without any loss. Nowadays, their technological...
02.05.2018 | Event News
13.04.2018 | Event News
12.04.2018 | Event News
18.05.2018 | Power and Electrical Engineering
18.05.2018 | Information Technology
18.05.2018 | Information Technology