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Tech, Special Report, Americas

Posted: 07 Jun 2022 18:29
by Asmqzwl
POSTSUBSCRIPT should have their internal structure affected by electron-degeneracy as they contract gravitationally after their formation. Those objects should be unable to release enough energy from hydrogen nuclear burning, since their central temperatures begin to decrease after degeneracy proceeds. They should never go through the usual stellar evolution phases, living as ”failed” stars. The theoretical calculations of the two pioneer papers in 1963 marked the birth of brown dwarfs fifty years ago. Following these predictions, the motivation was there for more theoretical calculations and evolutionary models for brown dwarfs Grossman (1970); Straka (1971); Rappaport and Joss (1984), followed by many others. With the discovery of the first genuine brown dwarfs about 20 years ago, (see the chapters by R. Rebolo, G. Basri, and by B. Oppenheimer in this volume), the theory and modelling of brown dwarfs have constantly developed and improved. The first major theoretical challenge was the development of an equation of state (EOS hereafter) appropriate for the description of the dense and relatively cool interior of brown dwarfs, accounting for the effects of electron partial degeneracy and interaction between particles, namely molecules, atoms, ions and electrons (see Chabrier and Baraffe (2000) and references therein).|The gravitational waves were detected on Sept. 14, 2015, at both of LIGO's detectors. That fateful day ushered in a whole new era of gravitational wave astronomy, says Gabriela Gonzalez, a spokesperson for the LIGO Scientific Collaboration. It was just a faint noise, the fleeting remnant of a massively violent event that happened a long time ago in a place very, very far away. But it was enough to confirm one of the major predictions made by Albert Einstein in his theory of general relativity back in 1915. Indeed, it verified the existence of something called gravitational waves - basically, ripples in the fabric of space-time, caused by the acceleration of really massive objects such as black holes. In a press conference, scientists from the Laser Interferometer Gravitational-Wave Observatory, a consortium that's been searching for gravitational waves since the 2000s, announced that the phenomenon finally had been detected by LIGO's twin detectors in Livingston, Louisiana, and Hanford, Washington.3 billion years ago, when two enormous black holes collided and merged into a single entity.




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Re: Tech, Special Report, Americas

Posted: 15 Mar 2023 04:24
by wangiskahn2