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Luciano Rezzolla
Luciano Rezzolla (born 1967) is an Italian professor of relativistic astrophysics and numerical relativity at the Goethe University Frankfurt. His main field of study is the physics and astrophysics of compact objects such as black holes and neutron stars. It was announced in 2019 that he had been appointed honorary Andrews Professor of Astronomy at Trinity College Dublin (TCD). Education Born in Milan, Italy, in 1967, Rezzolla completed his undergraduate degree in physics at the University of Bari and University of Trieste. After a year in the Italian Navy as submarine officer, he studied at SISSA and received his PhD in 1997 under the supervision of John C. Miller. Academic career After completing a postdoc at the University of Illinois at Urbana–Champaign studying black holes and neutron stars, he returned to SISSA as a research fellow, and ultimately an associate professor. In 2006 he became head of the numerical relativity group at the Max Planck Institute for Gravita ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Binary Neutron Stars
A neutron star is the collapsed core of a massive supergiant star, which had a total mass of between 10 and 25 solar masses, possibly more if the star was especially metal-rich. Except for black holes and some hypothetical objects (e.g. white holes, quark stars, and strange stars), neutron stars are the smallest and densest currently known class of stellar objects. Neutron stars have a radius on the order of and a mass of about 1.4 solar masses. They result from the supernova explosion of a massive star, combined with gravitational collapse, that compresses the core past white dwarf star density to that of atomic nuclei. Once formed, they no longer actively generate heat, and cool over time; however, they may still evolve further through collision or accretion. Most of the basic models for these objects imply that neutron stars are composed almost entirely of neutrons (subatomic particles with no net electrical charge and with slightly larger mass than protons); the electrons ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
De Volkskrant
''de Volkskrant'' (; ''The People's Paper'') is a Dutch daily morning newspaper. Founded in 1919, it has a nationwide circulation of about 250,000. Formerly a leading centre-left Catholic broadsheet, ''de Volkskrant'' today is a medium-sized centrist compact. Pieter Klok is the current editor-in-chief. History and profile ''De Volkskrant'' was founded in 1919 and has been a daily morning newspaper since 1921. Originally ''de Volkskrant'' was a Roman Catholic newspaper closely linked to the Catholic People's Party and the Catholic pillar. The paper temporarily ceased publication in 1941. On its re-founding in 1945, its office moved from Den Bosch to Amsterdam. It became a left-wing newspaper in the 1960s, but began softening its stance in 1980. On 23 August 2006 the ''Volkskrant'' published its 25,000th edition. In 1968, the ownership of De Volkskrant and Het Parool merged into a new parent, De Perscombinatie. Het Parool gained control due to the larger investment in the par ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Michael Kramer (astronomer)
Michael Kramer (born 1967 in Cologne) is a German radio astronomer and astrophysicist. He currently serves as a Director at the Max Planck Institute for Radio Astronomy in Bonn. He is also a professor at the University of Manchester and an Honorary Professor at the University of Bonn. Awards The Royal Astronomical Society, London, honoured Michael Kramer with the 2013 Herschel Medal for his work in the field of gravitational physics. He gave the 2016 George Darwin Sir George Howard Darwin, (9 July 1845 – 7 December 1912) was an English barrister and astronomer, the second son and fifth child of Charles Darwin and Emma Darwin. Biography George H. Darwin was born at Down House, Kent, the fifth chil ... lecture with the title, `Probing Einstein's Universe and its physics – the joy of being curious.’ He was one of the recipients of the 2020 Breakthrough Prize in Fundamental Physics, as a member of the Event Horizon Telescope Collaboration. References {{DEFAUL ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ScienceDaily
''Science Daily'' is an American website launched in 1995 that aggregates press releases and publishes lightly edited press releases (a practice called churnalism) about science, similar to Phys.org and EurekAlert!. The site was founded by married couple Dan and Michele Hogan in 1995; Dan Hogan formerly worked in the public affairs department of Jackson Laboratory writing press releases. The site makes money from selling advertisements. As of 2010, the site said that it had grown "from a two-person operation to a full-fledged news business with worldwide contributors". At the time, it was run out of the Hogans' home, had no reporters, and only reprinted press releases. In 2012, Quantcast Quantcast is an American technology company, founded in 2006, that specializes in AI-driven real-time advertising, audience insights and measurement. It has offices in the United States, Canada, Australia, Singapore, United Kingdom, Ireland, Fran ... ranked it at 614 with 2.6 million U.S. vi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
GW150914
The first direct observation of gravitational waves was made on 14 September 2015 and was announced by the LIGO and Virgo collaborations on 11 February 2016. Previously, gravitational waves had been inferred only indirectly, via their effect on the timing of pulsars in binary star systems. The waveform, detected by both LIGO observatories, matched the predictions of general relativity for a gravitational wave emanating from the inward spiral and merger of a pair of black holes of around 36 and 29 solar masses and the subsequent "ringdown" of the single resulting black hole. The signal was named GW150914 (from ''gravitational wave'' and the date of observation 2015-09-14). It was also the first observation of a binary black hole merger, demonstrating both the existence of binary stellar-mass black hole systems and the fact that such mergers could occur within the current age of the universe. This first direct observation was reported around the world as a remarkable accomplishme ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gravastar
A gravastar is an object hypothesized in astrophysics by Pawel O. Mazur and Emil Mottola as an alternative to the black hole theory. It has usual black hole metric outside of the horizon, but de Sitter metric inside. On the horizon there is a thin shell of matter. The term "gravastar" is a portmanteau of the words "gravitational vacuum star".. This solution of Einstein equations is stable and has no singularities. Structure In the original formulation by Mazur and Mottola, gravastars contain a central region featuring a false vacuum or "dark energy", a thin shell of perfect fluid, and a true vacuum exterior. The dark energy-like behavior of the inner region prevents collapse to a singularity and the presence of the thin shell prevents the formation of an event horizon, avoiding the infinite blue shift. The inner region has thermodynamically no entropy and may be thought of as a gravitational Bose–Einstein condensate. Severe red-shifting of photons as they climb out of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ars Technica
''Ars Technica'' is a website covering news and opinions in technology, science, politics, and society, created by Ken Fisher and Jon Stokes in 1998. It publishes news, reviews, and guides on issues such as computer hardware and software, science, technology policy, and video games. ''Ars Technica'' was privately owned until May 2008, when it was sold to Condé Nast Digital, the online division of Condé Nast Publications. Condé Nast purchased the site, along with two others, for $25 million and added it to the company's ''Wired'' Digital group, which also includes ''Wired'' and, formerly, Reddit. The staff mostly works from home and has offices in Boston, Chicago, London, New York City, and San Francisco. The operations of ''Ars Technica'' are funded primarily by advertising, and it has offered a paid subscription service since 2001. History Ken Fisher, who serves as the website's current editor-in-chief, and Jon Stokes created ''Ars Technica'' in 1998. Its purpose was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neutron Star
A neutron star is the collapsed core of a massive supergiant star, which had a total mass of between 10 and 25 solar masses, possibly more if the star was especially metal-rich. Except for black holes and some hypothetical objects (e.g. white holes, quark stars, and strange stars), neutron stars are the smallest and densest currently known class of stellar objects. Neutron stars have a radius on the order of and a mass of about 1.4 solar masses. They result from the supernova explosion of a massive star, combined with gravitational collapse, that compresses the core past white dwarf star density to that of atomic nuclei. Once formed, they no longer actively generate heat, and cool over time; however, they may still evolve further through collision or accretion. Most of the basic models for these objects imply that neutron stars are composed almost entirely of neutrons (subatomic particles with no net electrical charge and with slightly larger mass than protons); the electro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New Scientist
''New Scientist'' is a magazine covering all aspects of science and technology. Based in London, it publishes weekly English-language editions in the United Kingdom, the United States and Australia. An editorially separate organisation publishes a monthly Dutch-language edition. First published on 22 November 1956, ''New Scientist'' has been available in online form since 1996. Sold in retail outlets (paper edition) and on subscription (paper and/or online), the magazine covers news, features, reviews and commentary on science, technology and their implications. ''New Scientist'' also publishes speculative articles, ranging from the technical to the philosophical. ''New Scientist'' was acquired by Daily Mail and General Trust (DMGT) in March 2021. History Ownership The magazine was founded in 1956 by Tom Margerison, Max Raison and Nicholas Harrison as ''The New Scientist'', with Issue 1 on 22 November 1956, priced at one shilling (a twentieth of a pound in pre-decimal UK cu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fast Radio Burst
In radio astronomy, a fast radio burst (FRB) is a transient radio pulse of length ranging from a fraction of a millisecond to 3 seconds, caused by some high-energy astrophysical process not yet understood. Astronomers estimate the average FRB releases as much energy in a millisecond as the Sun puts out in three days. While extremely energetic at their source, the strength of the signal reaching Earth has been described as 1,000 times less than from a mobile phone on the Moon. The first FRB was discovered by Duncan Lorimer and his student David Narkevic in 2007 when they were looking through archival pulsar survey data, and it is therefore commonly referred to as the Lorimer Burst. Many FRBs have since been recorded, including several that have been detected to repeat in seemingly irregular ways. Only one FRB has been detected to repeat in a regular way: FRB 180916 seems to pulse every 16.35 days. Most FRBs are extragalactic, but the first Milky Way FRB was detected by the CHIME ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heino Falcke
Heino Falcke (born 26 September 1966) is a German Dutch professor of radio astronomy and astroparticle physics at the Radboud University Nijmegen. He was a winner of the 2011 Spinoza Prize. His main field of study is black holes, and he is the originator of the concept of the 'black hole shadow'. In 2013, a team under his lead earned a 14 million euro research grant from the European Research Council to further studies of black holes. In 2019, Falcke announced the first Event Horizon Telescope results at the EHT Press Conference in Brussels. Career Falcke was born in Cologne, Germany in 1966. He studied physics at the University of Cologne from 1986 to 1987, and then at the University of Bonn from 1987 where he graduated with a Diploma (equivalent to a master's degree) in Physics in 1992. He subsequently obtained a Doctor of Philosophy, PhD degree in Astronomy ''summa cum laude'' in 1994 from the University of Bonn. Falcke subsequently worked as a scientist for the Max Planck Instit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
