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
NASA detects solar flare pulses at Sun and Earth
17.11.2017 | NASA/Goddard Space Flight Center
Pluto's hydrocarbon haze keeps dwarf planet colder than expected
16.11.2017 | University of California - Santa Cruz
The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.
Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...
Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.
That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...
Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.
During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....
The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.
Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...
Pillared graphene would transfer heat better if the theoretical material had a few asymmetric junctions that caused wrinkles, according to Rice University...
15.11.2017 | Event News
15.11.2017 | Event News
30.10.2017 | Event News
17.11.2017 | Physics and Astronomy
17.11.2017 | Health and Medicine
17.11.2017 | Studies and Analyses