LAWRENCE, Kan. (WIBW) – A University of Kansas discovery shows a supernova may have been to blame for an extinction event that took place almost 360 million years ago.

The University of Kansas says in a paper published Aug. 18 in PNAS, three of its researches and their colleagues explain such a scenario for end-Devonian extinctions.

“For more than a decade, my colleagues and I have been interested in the possibility of ionizing radiation events causing extinction events on Earth,” said Adrian Melott, professor emeritus of physics & astronomy at the University of Kansas.

KU says previous findings point to the final extinction event of the Devonian happening simultaneously with a drop in ozone in Earth’s atmosphere.

“When I heard about the evidence for ozone depletion at the end–Devonian, it triggered thoughts about the possibility of a chain of nearby supernovae,” Melott said.

According to KU, previous research pointed to other possible causes for the ozone depletion like global warming, but n to astrophysical sources like exploding stars.

KU says, however, a fellow KU researcher’s findings suggest otherwise. It says Brian Thomas, an adjunct researcher in physics and astronomy and professor of physics at Washburn University, shows that atmospheric warming and the resulting injection of water into the lower stratosphere, which is suggested as a way to cause the ozone depletion, were not tenable.

KU says further, another of its researchers, Bruce Lieberman’s findings point to an astrophysical cause. It says Lieberman, who is a professor of ecology and evolutionary biology, previously emphasized that the end-Devonian extinctions had been part of a long period of diversity decline. It says the prolonged decline was followed by evidence of pollen malformations which suggest ionizing radiation as the cause.

According to KU, the researchers estimate the supernovae which triggered the events to be around 60 light-years away. It says to give context, Betelgeuse, a future supernova getting much attention for its recent behavior, is about 600 light-years away.

The researchers say the supernovae that triggered the end-Devonian extinction would have been close enough to cause radiation damage on Earth, but not close enough for life-threatening damage.

“The cosmic rays from such a supernova will produce muons in the atmosphere, which are a very penetrating kind of radiation,” Melott said. “They could cause internal damage in large animals and in organisms up to a half-mile down in the ocean.”

According to Melott, the major ionization of the lower atmosphere could have led to a lot of lightning, which could start fires and change the climate.

KU says the researchers’ collaborators on the paper come from the University of Illinois, King’s College London, European Organization for Nuclear Research, Estonia’s National Institute of Chemical Physics and Biophysics and the U.S. Air Force Academy.

Source: https://www.wibw.com/2020/08/29/supernova-may-account-for-aquatic-dinosaur-extinction/

World news – GB – Supernova may account for aquatic dinosaur extinction

En s’appuyant sur ses expertises dans les domaines du digital, des technologies et des process , CSS Engineering vous accompagne dans vos chantiers de transformation les plus ambitieux et vous aide Ă  faire Ă©merger de nouvelles idĂ©es, de nouvelles offres, de nouveaux modes de collaboration, de nouvelles maniĂšres de produire et de vendre.

CSS Engineering s’implique dans les projets de chaque client comme si c’était les siens. Nous croyons qu’une sociĂ©tĂ© de conseil devrait ĂȘtre plus que d’un conseiller. Nous nous mettons Ă  la place de nos clients, pour aligner nos incitations Ă  leurs objectifs, et collaborer pour dĂ©bloquer le plein potentiel de leur entreprise. Cela Ă©tablit des relations profondes et agrĂ©ables.

Nos services:

  1. Création des sites web professionnels
  2. Hébergement web haute performance et illimité
  3. Vente et installation des caméras de vidéo surveillance
  4. Vente et installation des systĂšme de sĂ©curitĂ© et d’alarme
  5. E-Marketing

Toutes nos réalisations ici https://www.css-engineering.com/en/works/

Previous articleDirt 5 Playground Trailer Shows Off User-Generated Arenas
Next articleTest : Devolo Magic 2 Wifi. –
Georges MOMO
Georges MOMO est IngĂ©nieur informatique ( DiplĂŽme obtenu Ă  3IL Limoges France) Il dĂ©but sa carriĂšre par un stage de fin d'Ă©tude d'ingĂ©nieur Ă  Toulouse sur un projet de AIRBUS Toulouse Blagnac, il enchaĂźne ensuite Ă  Nantes oĂč il travaille sur le projet de la migration documentaire de la BPCE. Son ambition le conduit ensuite Ă  Paris oĂč il travaille sur deux projets de la banque de France (Validation des titres de bourse Ă©mis sur le marchĂ© europĂ©en et la gĂ©nĂ©ration centralisĂ©e des documents) qu'il quitte quelques annĂ©es plus tard occupant le poste de responsable technique. PassionnĂ© de l'information, il est actif sur le web et sur le terrain depuis les annĂ©es 2000.

LEAVE A REPLY

Please enter your comment!
Please enter your name here