An astrophysicist from Lawrence Livermore National Laboratorys Institute for Geophysics and Planetary Physics has found that some nanodiamonds, the most famous and exotic form of stardust, may instead have formed within the inner solar system. The findings argue with the wide held belief that nanodiamonds recovered from meteorites from the asteroid belt have been the most abundant type of presolar stardust grain.
IGPP Director John Bradley, in conjunction with scientists from the Georgia Institute of Technology, the University of Washington, NASA Goddard Space Flight Center and the Natural History Museum in London, report their discovery in todays edition of Nature.
"We presumed that if we studied (micro) meteorites (also known as interplanetary dust particles) from comets further out in our solar system, we would find more nanodiamonds," Bradley said. "But were just not seeing them. One theory is that some, perhaps most, nanodiamonds formed within the inner solar system and are not presolar at all."
Interplanetary dust particles are collected in the stratosphere using NASA ER2 aircraft and they are made up of irregularly shaped grains of carbon and/or silicates.
One origin of stardust is from supernovae, the cataclysmic deaths of a star. For more than 30 years, astrophysicists have looked to stardust, a sort of remnant of stars, to tell the story of our solar systems origins.
But Bradley and the group of researchers report that at least some of the oldest cometary interplanetary dust particles contain little or no nanodiamond stardust at all.
"This raises all sorts of questions about the origins of our solar system," Bradley said. "Our findings are consistent with recent research that has detected nanodiamonds within the accretion discs of other young stars that are similar to our early solar system."
The group concludes that an alternative explanation for the lack of nanondiamonds in the early meteorites is that all meteoritic nanodiamonds are presolar, but that their abundance decreases the further they are from the sun. In that case, our understanding of large-scale transport and circulation within the early solar system is incomplete.
Anne Stark | EurekAlert
Move over, lasers: Scientists can now create holograms from neutrons, too
21.10.2016 | National Institute of Standards and Technology (NIST)
Finding the lightest superdeformed triaxial atomic nucleus
20.10.2016 | The Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences
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...
COMPAMED has become the leading international marketplace for suppliers of medical manufacturing. The trade fair, which takes place every November and is co-located to MEDICA in Dusseldorf, has been steadily growing over the past years and shows that medical technology remains a rapidly growing market.
In 2016, the joint pavilion by the IVAM Microtechnology Network, the Product Market “High-tech for Medical Devices”, will be located in Hall 8a again and will...
'Ferroelectric' materials can switch between different states of electrical polarization in response to an external electric field. This flexibility means they show promise for many applications, for example in electronic devices and computer memory. Current ferroelectric materials are highly valued for their thermal and chemical stability and rapid electro-mechanical responses, but creating a material that is scalable down to the tiny sizes needed for technologies like silicon-based semiconductors (Si-based CMOS) has proven challenging.
Now, Hiroshi Funakubo and co-workers at the Tokyo Institute of Technology, in collaboration with researchers across Japan, have conducted experiments to...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
21.10.2016 | Health and Medicine
21.10.2016 | Information Technology
21.10.2016 | Materials Sciences