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☆ Modern US earthquakes could be century-old aftershocks, study says
▼ + stars: | 2023-12-04 | by ( Allison Chinchar | ) edition.cnn.com time to read: +9 min

Earthquakes vs. aftershocksThe modern seismic activity the researchers studied is likely a mixture of aftershocks from the big quakes from the 1800s and background seismicity, Chen said. “Are small earthquakes in the New Madrid seismic zone aftershocks of 1811-1812 or not?” Hough said in an email. “The new study considers the question from a different angle, considering how tightly clustered earthquakes are, and concluding that some of the events are ongoing aftershocks,” Hough said. Aftershocks might still be continuing, but once the normal seismic rate for the area returns, she said, you can no longer identify them as aftershocks. “For this reason, we seismologists sometimes disagree about which earthquakes are foreshocks or aftershocks,” Ebel said, “and I think those disagreements are inherently unresolvable.”

Persons: —, ”, Yuxuan Chen, geoscientist, Chen, “, Susan Hough, Hough, ” Hough, “ We’ve, . Fuller, Morgan Page, John Ebel, Ebel, John Karl Hillers, ” Ebel Organizations: CNN, Missouri -, of Geophysical Research, Wuhan University, Earthquakes, US Geological Survey, Survey, . Geological, USGS Earthquake Science, Boston College, . Geological Survey, San Locations: States, Missouri, Missouri - Kentucky, Charleston , South Carolina, Madrid, Memphis, Mississippi, Charleston, North America, China, New Madrid, Chickasaw, Reelfoot Lake , Tennessee, Boston, California, Eastern North America, Southern California, Northern California, San Andreas, Central

☆ Mysterious flashes of light on Venus aren't what scientists thought, according to a new study. And it could mean safer missions to the planet in the future.
▼ + stars: | 2023-09-14 | by ( Sonam Sheth | Jenny Mcgrath | ) www.businessinsider.com time to read: +3 min

For years, scientists have observed flashes of light on Venus and thought they were lightning. That's good news for future missions to Venus since lightning would pose a threat to spacecraft. One reason the researchers don't think it's lightning is because of Venus' radio silence. AdvertisementAdvertisementThat's good news for future missions to Venus; if the flashes were lightning, it could pose a threat to probes entering the planet's atmosphere, according to NASA. AdvertisementAdvertisementNASA plans to send the DAVINCI probe to study Venus' clouds and geology in 2031 and hopefully retrieve other data when its atmospheric descent probe makes contact with the surface.

Persons: Venus Organizations: Service, NASA, of Geophysical Research, Cassini, Parker Solar Probe, Arizona State University, Steward, Venus Locations: Wall, Silicon, Soviet

☆ Small moonquakes caused by Apollo lunar lander module, study finds
▼ + stars: | 2023-09-14 | by ( Jackie Wattles | ) edition.cnn.com time to read: +6 min

CNN —A spacecraft left behind by US astronauts on the lunar surface could be causing small tremors known as moonquakes, according to a new study. The lunar surface is an extreme environment, oscillating between minus 208 degrees Fahrenheit (minus 133 degrees Celsius) in the dark and 250 degrees Fahrenheit (121 degrees Celsius) in direct sun, according to a news release about the study. Marusiak was not directly involved in the study, though she did have contact with the authors as a fellow expert in lunar seismology. “Every lunar morning when the sun hits the lander, it starts popping off,” said study coauthor Allen Husker, a research professor of geophysics at Caltech, in a statement. It’s important to note a key difference between the moon and Earth: On the lunar surface, there are no shifting tectonic plates that might cause catastrophic events.

Persons: Francesco Civilini, Artemis, Dr, Angela Marusiak, Marusiak, moonquakes Marusiak, “, —, ”, Allen Husker, I’m, seismometers, ” Marusiak, ” Husker Organizations: CNN, of Geophysical Research, California Institute of Technology, NASA Goddard Space Flight, NASA, University of Arizona’s, Laboratory, Caltech, Indian Space Research Organization, ISRO Locations: California

☆ Billionaire Richard Branson defends space travel, argues it can benefit planet
▼ + stars: | 2023-05-04 | by ( Anmar Frangoul | ) www.cnbc.com time to read: +3 min

Richard Branson on board Virgin Galactic's VSS Unity in July 2021. The billionaire believes the environmental costs of space travel are set to "come down even further." British billionaire Richard Branson believes space travel can be beneficial for the planet, arguing that trips like the one he undertook in 2021 open doors and cut red tape. During his interview with the BBC, Branson described space travel as being "incredibly important" for the Earth and made the case for it to continue. "Communication between people is being transformed because of space travel and satellites up there," he said.

☆ Why aluminum plants in the U.S. are far more polluting than some of their counterparts abroad
▼ + stars: | 2022-12-06 | by ( Phil Mckenna | Inside Climate News | ) www.nbcnews.com time to read: +15 min

A plant worker uses a crane to lift a cask of molten aluminum a Century Aluminum Company plant in Hawesville, Ky. in 2017. Of the five remaining facilities, only the Century Aluminum Sebree plant in Robards, which employs 625 workers, and a smaller Alcoa plant in Massena, New York, run at full capacity. Phillip McKenna/NBC NewsSteinsen, of Century Aluminum, said the company has no plans to shut down its Sebree facility in Robards. In 2015, when the U.S. aluminum production was in steep decline, the EPA ended its industry partnership. In 2019, 7,510 metric tons of PFCs were emitted from global aluminum production, according to a study published last year in the Journal of Geophysical Research — Atmospheres.

☆ Aluminum plants in the U.S. are releasing tons of a highly potent greenhouse gas, unlike their counterparts abroad
▼ + stars: | 2022-12-06 | by ( Phil Mckenna | Inside Climate News | ) www.cnbc.com time to read: +7 min

In written testimony submitted to the U.S. International Trade Commission in 2017, Century Aluminum executives said aluminum producers were being "decimated" by "unfair practices of Chinese aluminum producers." "The continued viability of the aluminum industry outside of China, and especially in the United States, is dependent upon a prompt and effective solution to China's overcapacity and overproduction." Steinsen, of Century Aluminum, said the company has no plans to shut down its Sebree facility in Robards. A spokesperson for the agency said, "EPA continues to track facility specific emissions from the aluminum industry through the Greenhouse Gas Reporting Program." In 2019, 7,510 metric tons of PFCs were emitted from global aluminum production, according to a study published last year in the Journal of Geophysical Research — Atmospheres.

☆ NASA a detectat primele radiații X dinspre Uranus
▼ + stars: | 2021-04-06 | by ( ) www.jurnal.md time to read: +2 min

Sursa foto: NASANASA a detectat primele radiații X dinspre UranusPrimele radiații X emise de Uranus au fost înregistrate datorită Observatorului de raze X Chandra al NASA. A șaptea planetă din Sistemul Solar este considerată, alături de Neptun, unul dintre cei doi giganți de gheață. Există indicii că unele dintre razele X observate nu sunt pur și simplu împrăștiate de Soare, ci sunt produse de planetă. Inelele lui Saturn emit raze X, deci ar putea să se întâmple același lucru și cu cele ale lui Uranus. Astrofizicienii vor trebui să desfășoare mai multe observații pentru a înțelege de unde provin exact razele X de la Uranus.

Persons: Uranus, NASA, Neptun, Uranus . Organizations: NASA NASA, Geophysical Research, Physics, Saturn

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