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
Cherned up to the maximum
10.07.2020 | Max-Planck-Institut für Chemische Physik fester Stoffe
Porous graphene ribbons doped with nitrogen for electronics and quantum computing
09.07.2020 | University of Basel
New insight into the spin behavior in an exotic state of matter puts us closer to next-generation spintronic devices
Aside from the deep understanding of the natural world that quantum physics theory offers, scientists worldwide are working tirelessly to bring forth a...
Kiel physics team observed extremely fast electronic changes in real time in a special material class
In physics, they are currently the subject of intensive research; in electronics, they could enable completely new functions. So-called topological materials...
Solar cells based on perovskite compounds could soon make electricity generation from sunlight even more efficient and cheaper. The laboratory efficiency of these perovskite solar cells already exceeds that of the well-known silicon solar cells. An international team led by Stefan Weber from the Max Planck Institute for Polymer Research (MPI-P) in Mainz has found microscopic structures in perovskite crystals that can guide the charge transport in the solar cell. Clever alignment of these "electron highways" could make perovskite solar cells even more powerful.
Solar cells convert sunlight into electricity. During this process, the electrons of the material inside the cell absorb the energy of the light....
Empa researchers have succeeded in applying aerogels to microelectronics: Aerogels based on cellulose nanofibers can effectively shield electromagnetic radiation over a wide frequency range – and they are unrivalled in terms of weight.
Electric motors and electronic devices generate electromagnetic fields that sometimes have to be shielded in order not to affect neighboring electronic...
A promising operating mode for the plasma of a future power plant has been developed at the ASDEX Upgrade fusion device at Max Planck Institute for Plasma...
07.07.2020 | Event News
02.07.2020 | Event News
19.05.2020 | Event News
10.07.2020 | Life Sciences
10.07.2020 | Materials Sciences
10.07.2020 | Life Sciences