Scientists studying a sample of oceanic crust retrieved from the Pacific seabed nearly a mile down have discovered traces of a rare isotope of plutonium, the deadly element that has been central to the atomic age.
They say it was made in colliding stars and later rained down through Earth's atmosphere as cosmic dust millions of years ago. Their analysis opens a new window on the cosmos.
"It's amazing that a few atoms on Earth can help us learn about where half of all the heavier elements in our universe are synthesized," said Anton Wallner, the paper's first author and a nuclear physicist. Dr. Wallner works at the Australian National University as well as the Helmholtz Center in Dresden, Germany.
UFO studies and the possibility of alien origin
(CBS News) - We've always been fascinated by aliens, and that's putting it mildly. And mathematically speaking, aliens should exist.
"There are two trillion other galaxies we can see, each with a 100 billion Earth-like worlds," said Seth Shostak , the senior astronomer at the SETI Institute. [SETI stands for the Search for Extraterrestrial Intelligence.] "100 billion, OK? It's hard to believe they're all sterile."
Correspondent David Pogue asked, "I happen to know that this is sort of a trick question when people say, 'Do UFOs exist?'"
Subscribe to read | Financial Times
60Fe and 244Pu deposited on Earth constrain the r-process yields of recent nearby supernovae |
By A. Wallner , M. B. Froehlich , M. A. C. Hotchkis , N. Kinoshita , M. Paul , M. Martschini , S. Pavetich , S. G. Tims , N. Kivel , D. Schumann , M. Honda , H. Matsuzaki , T. Yamagata
Naturally occurring plutonium in a deep-sea crust sample constrains nucleosynthesis in nearby supernovae.
Australia's Never-Ending Travel Ban - The New York Times
My husband, who is American, moved to Australia in 2017 with a promise to his parents — who are now in their 70s and 80s — that he would visit regularly and come home immediately if there was a need. Those promises have been broken.
The Australian government is allowing travel exemptions for some family members under some circumstances, but parents and grandparents are generally not eligible for those exemptions. My son was turning 16 the last time he saw any of his grandparents — by the time he sees them next, he will be almost 19 (at best). An adult. These are years no one can get back.
Are These The Youngest Baby Planets Ever Detected? | king5.com
Xi Focus: Xi extends congratulations on China's first Mars landing - Xinhua | English.news.cn
BEIJING, May 15 (Xinhua) -- Chinese President Xi Jinping on Saturday extended congratulations on the successful landing of China's first probe on Mars.
On behalf of the Communist Party of China (CPC) Central Committee, the State Council and the Central Military Commission (CMC), Xi, also general secretary of the CPC Central Committee and chairman of the CMC, extended warm congratulations and sincere greetings to all members who have participated in the Mars exploration mission, Tianwen-1, in a congratulatory message.
Geoscientist Shichun Huang Receives NSF CAREER Award | College of Sciences | University of
Happening on Twitter
The Unidentified Aerial Phenomena Task Force is set to share what it knows about UFOs by June 1 this year. Butchy D… https://t.co/vuukdrkJwD RT_com Sat May 15 11:00:01 +0000 2021
A phased array radar sensing system that is developed by the No.2 Institute of state-owned aerospace giant CASIC we… https://t.co/nj0V6IDC0r globaltimesnews (from Beijing, China) Sat May 15 01:20:49 +0000 2021
A new documentary tells the story of the scientists searching for signs of extraterrestrial life & is organized aro… https://t.co/vMJxuPk5PW ScienceMagazine (from Washington, DC & Cambridge, UK) Fri May 14 21:00:07 +0000 2021
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