Lead sulfide — also known by its mineral name, galena — is a naturally occurring mineral found in Missouri, other parts of the world, and now ... other parts of the solar system.
Bruce Fegley, Jr., Ph.D., professor of earth and planetary sciences in Arts & Sciences, and Laura Schaefer, resarch assistant in the Planetary Chemistry Laboratory, with a chunk of galena, or lead sulfide. The researchers have determined that the feature on Venus that looks like snow is composed of both lead and bismuth sulfides, settling a long-time controversy in the planetary community.
David Kilper/WUSTL Photo
Thats because recent thermodynamic calculations by researchers at Washington University in St. Louis provide plausible evidence that "heavy metal snow," which blankets the surface of upper altitude Venusian rocks, is composed of both lead and bismuth sulfides.
The findings — by Laura Schaefer, research assistant in the Planetary Chemistry Laboratory, and M. Bruce Fegley, Jr., Ph.D., professor of Earth & Planetary Sciences in Arts & Sciences — discount previous hypotheses that the snow was made of elemental tellurium. They are important also because lead sulfide "snow" could allow the dating of Venus by lead isotopes, provided a soil sample can be obtained in a future mission.
Carolyn Jones Otten | WUSTL
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21.04.2017 | Stockholm University
The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.
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Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.
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Two researchers at Heidelberg University have developed a model system that enables a better understanding of the processes in a quantum-physical experiment...
Glaciers might seem rather inhospitable environments. However, they are home to a diverse and vibrant microbial community. It’s becoming increasingly clear that they play a bigger role in the carbon cycle than previously thought.
A new study, now published in the journal Nature Geoscience, shows how microbial communities in melting glaciers contribute to the Earth’s carbon cycle, a...
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