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Amaterasu Particle
The Amaterasu particle, named after the sun goddess in Japanese mythology, was an unexpected ultra-high-energy cosmic ray detected in 2021 and later identified in 2023, using the Telescope Array Project observatory in Utah, United States. It had an energy exceeding 240 exa-electronvolts (EeV) and was inferred through the two dozen particles it sent toward ground detectors. This single particle appears to have emerged, inexplicably, from the Local Void, an empty area of space bordering the Milky Way The Milky Way or Milky Way Galaxy is the galaxy that includes the Solar System, with the name describing the #Appearance, galaxy's appearance from Earth: a hazy band of light seen in the night sky formed from stars in other arms of the galax ... galaxy. The single subatomic particle held energy roughly equivalent to a brick dropping to the ground from waist height. According to study leader, Associate Professor Toshihiro Fujii from Osaka Metropolitan University, "No promisin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amaterasu
, often called Amaterasu () for short, also known as and , is the goddess of the sun in Japanese mythology. Often considered the chief deity (''kami'') of the Shinto pantheon, she is also portrayed in Japan's earliest literary texts, the () and the (720 CE), as the ruler (or one of the rulers) of the heavenly realm Takamagahara and as the mythical ancestress of the Imperial House of Japan via her grandson Ninigi. Along with two of her siblings (the moon deity Tsukuyomi and the impetuous storm-god Susanoo) she ranks as one of the "Three Precious Children" (, ), the three most important offspring of the creator god Izanagi. Amaterasu's chief place of worship, the Grand Shrine of Ise in Ise, Mie Prefecture, is one of Shinto's holiest sites and a major pilgrimage center and tourist spot. As with other Shinto ''kami'', she is also enshrined in a number of Shinto shrines throughout Japan. Name The goddess is referred to as ''Amaterasu Ōmikami'' ( / ; historical orthogr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ultra-high-energy Cosmic Ray
In astroparticle physics, an ultra-high-energy cosmic ray (UHECR) is a cosmic ray with an energy greater than 1 EeV (1018 electronvolts, approximately 0.16 joules), far beyond both the rest mass and energies typical of other cosmic ray particles. The origin of these highest energy cosmic rays is not known. These particles are extremely rare; between 2004 and 2007, the initial runs of the Pierre Auger Observatory (PAO) detected 27 events with estimated arrival energies above , that is, about one such event every four weeks in the area surveyed by the observatory. Observational history The first observation of a cosmic ray particle with an energy exceeding (16 J) was made by John Linsley and Livio Scarsi at the Volcano Ranch experiment in New Mexico in 1962. Cosmic ray particles with even higher energies have since been observed. Among them was the Oh-My-God particle observed by the University of Utah's Fly's Eye experiment on the evening of 15 October 1991 over ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telescope Array Project
The Telescope Array project is an international collaboration involving research and educational institutions in Japan, The United States, Russia, South Korea, and Belgium. The experiment is designed to observe air showers induced by ultra-high-energy cosmic ray using a combination of ground array and air-fluorescence techniques. It is located in the high desert in Millard County, Utah, Millard County, Utah, United States, at about above sea level. Overview The Telescope Array observatory is a hybrid detector system consisting of both an array of 507 scintillation surface detectors (SD) which measure the distribution of charged particles at the Earth's surface, and three fluorescence stations which observe the night sky above the SD array.T. AbuZayyad et al.,The surface detector array of the Telescope Array experiment Nuclear Instruments and Methods in Physics Research Section A: (2012) vol. 689 Each fluorescence station is also accompanied by a LIDAR system for atmospheric mon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Utah
Utah is a landlocked state in the Mountain states, Mountain West subregion of the Western United States. It is one of the Four Corners states, sharing a border with Arizona, Colorado, and New Mexico. It also borders Wyoming to the northeast, Idaho to the north, and Nevada to the west. In comparison to all the U.S. states and territories, Utah, with a population of just over three million, is the List of U.S. states and territories by area, 13th largest by area, the List of U.S. states and territories by population, 30th most populous, and the List of U.S. states by population density, 11th least densely populated. Urban development is mostly concentrated in two regions: the Wasatch Front in the north-central part of the state, which includes the state capital, Salt Lake City, and is home to roughly two-thirds of the population; and Washington County, Utah, Washington County in the southwest, which has approximately 180,000 residents. Most of the western half of Utah lies in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electronvolt
In physics, an electronvolt (symbol eV), also written electron-volt and electron volt, is the measure of an amount of kinetic energy gained by a single electron accelerating through an Voltage, electric potential difference of one volt in vacuum. When used as a Units of energy, unit of energy, the numerical value of 1 eV in joules (symbol J) is equal to the numerical value of the Electric charge, charge of an electron in coulombs (symbol C). Under the 2019 revision of the SI, this sets 1 eV equal to the exact value Historically, the electronvolt was devised as a standard unit of measure through its usefulness in Particle accelerator#Electrostatic particle accelerators, electrostatic particle accelerator sciences, because a particle with electric charge ''q'' gains an energy after passing through a voltage of ''V''. Definition and use An electronvolt is the amount of energy gained or lost by a single electron when it moves through an Voltage, electric potential differenc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Local Void
The Local Void is a vast, Void (astronomy), empty region of Interstellar medium, space, lying adjacent to the Local Group. Discovered by R. Brent Tully, Brent Tully and J. Richard Fisher, Rick Fisher in 1987, the Local Void is now known to be composed of three separate sectors, separated by bridges of "wispy Galaxy filament, filaments". The precise extent of the void is unknown, but it is at least 45 parsec, Mpc (150 million light-years) across, and possibly 150 to 300 Mpc. The Local Void appears to have significantly fewer Galaxy, galaxies than expected from standard cosmology. Location and dimensions Voids are affected by the way gravity causes matter in the universe to "clump together", herding galaxies into Galaxy groups and clusters, clusters and chains, which are separated by regions mostly devoid of galaxies, yet the exact mechanisms are subject to scientific debate. Astronomers have previously noticed that the Milky Way sits in a large, flat array of galaxies ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Milky Way
The Milky Way or Milky Way Galaxy is the galaxy that includes the Solar System, with the name describing the #Appearance, galaxy's appearance from Earth: a hazy band of light seen in the night sky formed from stars in other arms of the galaxy, which are so far away that they cannot be individually distinguished by the naked eye. The Milky Way is a barred spiral galaxy with a Galaxy#Isophotal diameter, D25 isophotal diameter estimated at , but only about 1,000 light-years thick at the spiral arms (more at the bulge). Recent simulations suggest that a dark matter area, also containing some visible stars, may extend up to a diameter of almost 2 million light-years (613 kpc). The Milky Way has several List of Milky Way's satellite galaxies, satellite galaxies and is part of the Local Group of galaxies, forming part of the Virgo Supercluster which is itself a component of the Laniakea Supercluster. It is estimated to contain 100–400 billion stars and at least that number of pla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Guardian
''The Guardian'' is a British daily newspaper. It was founded in Manchester in 1821 as ''The Manchester Guardian'' and changed its name in 1959, followed by a move to London. Along with its sister paper, ''The Guardian Weekly'', ''The Guardian'' is part of the Guardian Media Group, owned by the Scott Trust Limited. The trust was created in 1936 to "secure the financial and editorial independence of ''The Guardian'' in perpetuity and to safeguard the journalistic freedom and liberal values of ''The Guardian'' free from commercial or political interference". The trust was converted into a limited company in 2008, with a constitution written so as to maintain for ''The Guardian'' the same protections as were built into the structure of the Scott Trust by its creators. Profits are reinvested in its journalism rather than distributed to owners or shareholders. It is considered a newspaper of record in the UK. The editor-in-chief Katharine Viner succeeded Alan Rusbridger in 2015. S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Osaka Metropolitan University
, abbreviated to OMU, is a Japanese public university that was established through the integration of Osaka City University (OCU) and Osaka Prefecture University (OPU) on 1 April 2022. OMU was inaugurated with 1 undergraduate college, 11 undergraduate schools and 15 graduate schools. With the integration of the two universities, the number of students amounts to about 16,000, which is the largest scale in Japan as a public university. In addition, OMU's number of new first-year students per year is 2,853, placing it in third place among Japanese national/public universities, after Osaka University and the University of Tokyo.大阪公立大学（仮称）2022年開学予定（構想中）／ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cosmos (Australian Magazine)
''Cosmos'' (subtitled The Science of Everything) is a science magazine published in Adelaide, South Australia, by CSIRO Publishing that covers science globally. It appears four times a year in print as ''Cosmos Magazine'', and the online edition is updated daily with news as well as long features and multi-media content, and includes the print magazine content. ''Cosmos Weekly'' is a subscription-based weekly online edition published on Fridays, and a podcast was launched in April 2022. History The magazine was established in Sydney in November 2004 by the Sydney magazine publishing executive Kylie Ahern and science journalist Wilson da Silva. with the first issue published in July 2005. In June 2006, the magazine launched a daily Internet news and features service. The magazine was the originator of '' Hello from Earth'', a web-based initiative to send messages from the public, each just 160 characters in length, to Gliese 581d, the (then) nearest Earth-like planet outsid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oh-My-God Particle
The Oh-My-God particle was an ultra-high-energy cosmic ray detected on 15 October 1991 by the Fly's Eye camera in Dugway Proving Ground, Utah, United States. , it is the highest-energy cosmic ray ever observed. Its energy was estimated as (320 exa-eV). The particle's energy was unexpected and called into question prevailing theories about the origin and propagation of cosmic rays. Speed It is not known what kind of particle it was, but most cosmic rays are protons. If m_\mathrm is the rest mass of the particle and E_\mathrm is its kinetic energy (energy above the rest mass energy), then its speed was very close to \sqrt times the speed of light. Since E_\mathrm \gg m_\mathrmc^2, this ratio can be simplified to 1-\frac _\mathrmc^2/E_\mathrm2. Assuming it was a proton, for which m_\mathrmc^2 is 938 MeV, this means it was traveling at times the speed of light, its Lorentz factor was and its rapidity was . This is 1.3 femtometers per second less than the speed of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Greisen–Zatsepin–Kuzmin Limit
The Greisen–Zatsepin–Kuzmin limit (GZK limit or GZK cutoff) is a theoretical upper limit on the energy of cosmic ray protons traveling from other galaxies through the intergalactic medium to our galaxy. The limit is (50 EeV), or about 8 joules (the energy of a proton travelling at ≈ % the speed of light). The limit is set by the slowing effect of interactions of the protons with the microwave background radiation over long distances (≈ 160 million light-years). The limit is at the same order of magnitude as the upper limit for energy at which cosmic rays have experimentally been detected, although indeed some detections appear to have exceeded the limit, as noted below. For example, one extreme-energy cosmic ray, the Oh-My-God Particle, which has been found to possess a record-breaking (50 joules) of energy (about the same as the kinetic energy of a 95 km/h baseball). In the past, the apparent violation of the GZK limit has inspired cosmologists and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
