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Clue to a 1,000-year-old astrophysical mystery


Clue to a 1,000-year-old astrophysical mystery
Researchers identify rare electron-capture supernova that may help explain the development of Crab Nebula.
August 4, 2021, 8:50 am
A color composite of the electron-capture supernova 2018zd (the large white dot on the right) and the host starburst galaxy NGC 2146 (toward the left). Credit: NASA/STScI/J. DePasquale; Las Cumbres Observatory
Researchers from Tel Aviv University and the University of Tokyo have identified a rare “electron-capture” supernova, and in the process, may have shed light on an astrophysical mystery dating back nearly 1,000 years.
An electron-capture supernova occurs when a star eight to nine times the mass of the Earth’s sun explodes. A thermonuclear supernova occurs after the explosion of a white dwarf star that has gained matter in a binary star system. A core-collapse supernova occurs when a massive star runs out of nuclear fuel and its core collapses, creating a black hole or a neut ....

United States , Koichi Itagaki , Las Cumbres , Daichi Hiramatsu , University Of California , Faculty Of Exact Sciences , University Of California Santa Barbara , University Of Tokyo , Tel Aviv University , Exact Sciences , Yisrael Hadari , Iair Arcavi , Nature Astronomy , California Santa Barbara , Las Cumbres Observatory , Hubble Space , Milky Way , Crab Nebula , Global Supernova Project , ஒன்றுபட்டது மாநிலங்களில் , லாஸ் கும்ப்ரேஸ் , தைய்சி ஹிராமட்சு , பல்கலைக்கழகம் ஆஃப் கலிஃபோர்னியா , ஆசிரிய ஆஃப் சரியான அறிவியல் , பல்கலைக்கழகம் ஆஃப் கலிஃபோர்னியா சாந்தா பார்பரா , பல்கலைக்கழகம் ஆஃப் டோக்கியோ ,

Very strong mag. 6.1 earthquake - North Pacific Ocean, 172 km south of David, Provincia de Chiriqui, Panama, on 17 Jul 2:56 pm (GMT -6) - 233 user experience reports


User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Paso Ancho, Tierras Altas, Chiriqui Province, Pana (213.2 km N of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 15-20 s :
I felt the whole house shake, but nothing fell over or broke. Our dogs seemed to be aware of it. It woke my husband from his nap. It lasted for about 15 seconds. It was felt by friends in Cerro Punta and Boquete. | 6 users found this interesting.   
Is anyone concerned about a tsunami since it was off shore and fairly strong at 6.2? ....

Provincia De Chiriqui , Costa Rica , San Josét , Bocas Del Toro , Vista Alegre , Provincia De Herrera , Rio Hato , La Concepcion , Provincia De Colon , San Francisco , United States , Bajo Boquete , Hone Creek , San Isidro , Panama City , Mata Del Nance , San Miguelito , Provincia De Puntarenas , Nueva Gorgona , Provincia De Panama , Isla Colon , El Valle De Anton , Punta Uva , Potrerillos Arriba , Puerto Cortes , Puerto Viejo ,