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SGR 1806−20
SGR 1806−20 is a magnetar, a type of neutron star with a very powerful magnetic field, that was discovered in 1979 and identified as a soft gamma repeater. SGR 1806−20 is located about 13 kiloparsecs (42,000 light-years) from Earth on the far side of the Milky Way in the constellation of Sagittarius. It has a diameter of no more than and rotates on its axis every 7.5 seconds ( rotation speed at the surface). , SGR 1806-20 is the most highly magnetized object ever observed, with a magnetic field over 1015 gauss (G) (1011 tesla) in intensity (compared to the Sun's 1–5 G and Earth's 0.25–0.65 G). Explosion Fifty thousand years after a starquake occurred on the surface of SGR 1806-20, the radiation from the resultant explosion reached Earth on December 27, 2004 ( GRB 041227). In terms of gamma rays, the burst had an absolute magnitude around −29. It was the brightest event known to have been sighted on this planet from an origin outside the Solar System, unti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SGR 1806-20 108685main SRB1806 20rev2
SGR may refer to: * Heart Colchester and Heart Ipswich, radio stations in Suffolk, England both once known as SGR * Sagittarius (constellation) abbreviation * ''Scary Go Round'', a webcomic * Scientists for Global Responsibility, a United Kingdom group that promotes the ethical practice and use of science and technology * Segar LRT station in Bukit Panjang, Singapore (LRT station abbreviation) * Select Graphic Rendition (ANSI), an ANSI X3.64 escape sequence * Service Général du Renseignement et de la Sécurité, the French name of the Belgian General Information and Security Service * SGR (band), a ska band from New Jersey, United States * Shale Gouge Ratio, a mathematical algorithm aiming to predict the fault rock types for simple fault zones * The Shaw Group, a company which formerly used as its ticker symbol * Slade Green railway station in London, England (National Rail station code) * Smart_green_resilient, Smart Green Resilient (planning concept) abbreviation * Societa' di G ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Light-year
A light-year, alternatively spelled light year, is a large unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometers (), or 5.88 trillion miles ().One trillion here is taken to be 1012 (one million million, or billion in long scale). As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in a vacuum in one Julian year (365.25 days). Because it includes the time-measurement word "year", the term ''light-year'' is sometimes misinterpreted as a unit of time. The ''light-year'' is most often used when expressing distances to stars and other distances on a galactic scale, especially in non-specialist contexts and popular science publications. The unit most commonly used in professional astronomy is the parsec (symbol: pc, about 3.26 light-years) which derives from astrometry; it is the distance at which one astronomical unit subtends an angle of one second of arc. Defini ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solar System
The Solar SystemCapitalization of the name varies. The International Astronomical Union, the authoritative body regarding astronomical nomenclature, specifies capitalizing the names of all individual astronomical objects but uses mixed "Solar System" and "solar system" structures in theinaming guidelines document. The name is commonly rendered in lower case ('solar system'), as, for example, in the ''Oxford English Dictionary'' an''Merriam-Webster's 11th Collegiate Dictionary''. is the gravity, gravitationally bound system of the Sun and the objects that orbit it. It Formation and evolution of the Solar System, formed 4.6 billion years ago from the gravitational collapse of a giant interstellar molecular cloud. The solar mass, vast majority (99.86%) of the system's mass is in the Sun, with most of the Jupiter mass, remaining mass contained in the planet Jupiter. The four inner Solar System, inner system planets—Mercury (planet), Mercury, Venus, Earth and Mars—are terrest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Swift Gamma-Ray Burst Mission
Neil Gehrels Swift Observatory, previously called the Swift Gamma-Ray Burst Explorer, is a NASA three-telescope space observatory for studying gamma-ray bursts (GRBs) and monitoring the afterglow in X-ray, and UV/Visible light at the location of a burst. It was launched on 20 November 2004, aboard a Delta II launch vehicle. Headed by principal investigator Neil Gehrels until his death in February 2017, the mission was developed in a joint partnership between Goddard Space Flight Center (GSFC) and an international consortium from the United States, United Kingdom, and Italy. The mission is operated by Pennsylvania State University as part of NASA's Medium Explorer program (MIDEX). The burst detection rate is 100 per year, with a sensitivity ~3 times fainter than the BATSE detector aboard the Compton Gamma Ray Observatory. The Swift mission was launched with a nominal on-orbit lifetime of two years. Swift is a NASA MIDEX (medium-class Explorer) mission. It was the third to be lau ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Observatory
An observatory is a location used for observing terrestrial, marine, or celestial events. Astronomy, climatology/meteorology, geophysical, oceanography and volcanology are examples of disciplines for which observatories have been constructed. Historically, observatories were as simple as containing an astronomical sextant (for measuring the distance between stars) or Stonehenge (which has some alignments on astronomical phenomena). Astronomical observatories Astronomical observatories are mainly divided into four categories: space-based, airborne, ground-based, and underground-based. Ground-based observatories Ground-based observatories, located on the surface of Earth, are used to make observations in the radio and visible light portions of the electromagnetic spectrum. Most optical telescopes are housed within a dome or similar structure, to protect the delicate instruments from the elements. Telescope domes have a slit or other opening in the roof that can be opened during ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Starquake (astrophysics)
A quake is the result when the surface of a planet, moon or star begins to shake, usually as the consequence of a sudden release of energy transmitted as seismic waves, and potentially with great violence. The types of quakes include: Earthquake An earthquake is a phenomenon that results from the sudden release of stored energy in the Earth's crust that creates seismic waves. At the Earth's surface, earthquakes may manifest themselves by a shaking or displacement of the ground and sometimes cause tsunamis, which may lead to loss of life and destruction of property. An earthquake is caused by tectonic plates (sections of the Earth's crust) getting stuck and putting a strain on the ground. The strain becomes so great that rocks give way and fault lines occur. Moonquake A moonquake is the lunar equivalent of an earthquake (i.e., a quake on the Moon) although moonquakes are caused in different ways. They were first discovered by the Apollo astronauts. The largest moonquakes are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SGR 1806-20 108536main NeutronStar-Print1
SGR may refer to: * Heart Colchester and Heart Ipswich, radio stations in Suffolk, England both once known as SGR * Sagittarius (constellation) abbreviation * '' Scary Go Round'', a webcomic * Scientists for Global Responsibility, a United Kingdom group that promotes the ethical practice and use of science and technology * Segar LRT station in Bukit Panjang, Singapore (LRT station abbreviation) * Select Graphic Rendition (ANSI), an ANSI X3.64 escape sequence * Service Général du Renseignement et de la Sécurité, the French name of the Belgian General Information and Security Service * SGR (band), a ska band from New Jersey, United States * Shale Gouge Ratio, a mathematical algorithm aiming to predict the fault rock types for simple fault zones * The Shaw Group, a company which formerly used as its ticker symbol * Slade Green railway station in London, England (National Rail station code) * Smart Green Resilient (planning concept) abbreviation * Societa' di Gestione del Ris ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SGR 1806-20 108530main CloudballPrint
SGR may refer to: * Heart Colchester and Heart Ipswich, radio stations in Suffolk, England both once known as SGR * Sagittarius (constellation) abbreviation * '' Scary Go Round'', a webcomic * Scientists for Global Responsibility, a United Kingdom group that promotes the ethical practice and use of science and technology * Segar LRT station in Bukit Panjang, Singapore (LRT station abbreviation) * Select Graphic Rendition (ANSI), an ANSI X3.64 escape sequence * Service Général du Renseignement et de la Sécurité, the French name of the Belgian General Information and Security Service * SGR (band), a ska band from New Jersey, United States * Shale Gouge Ratio, a mathematical algorithm aiming to predict the fault rock types for simple fault zones * The Shaw Group, a company which formerly used as its ticker symbol * Slade Green railway station in London, England (National Rail station code) * Smart Green Resilient (planning concept) abbreviation * Societa' di Gestione del Ris ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earth's Magnetic Field
Earth's magnetic field, also known as the geomagnetic field, is the magnetic field that extends from Earth's interior out into space, where it interacts with the solar wind, a stream of charged particles emanating from the Sun. The magnetic field is generated by electric currents due to the motion of convection currents of a mixture of molten iron and nickel in Earth's outer core: these convection currents are caused by heat escaping from the core, a natural process called a geodynamo. The magnitude of Earth's magnetic field at its surface ranges from . As an approximation, it is represented by a field of a magnetic dipole currently tilted at an angle of about 11° with respect to Earth's rotational axis, as if there were an enormous bar magnet placed at that angle through the center of Earth. The North geomagnetic pole actually represents the South pole of Earth's magnetic field, and conversely the South geomagnetic pole corresponds to the north pole of Earth's magnetic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tesla (unit)
The tesla (symbol: T) is the unit of magnetic flux density (also called magnetic B-field strength) in the International System of Units (SI). One tesla is equal to one weber per square metre. The unit was announced during the General Conference on Weights and Measures in 1960 and is named in honour of Serbian-American electrical and mechanical engineer Nikola Tesla, upon the proposal of the Slovenian electrical engineer France Avčin. Definition A particle, carrying a charge of one coulomb (C), and moving perpendicularly through a magnetic field of one tesla, at a speed of one metre per second (m/s), experiences a force with magnitude one newton (N), according to the Lorentz force law. That is, : \text = \dfrac. As an SI derived unit, the tesla can also be expressed in terms of other units. For example, a magnetic flux of 1 weber (Wb) through a surface of one square meter is equal to a magnetic flux density of 1 tesla.''The International System of Units (SI), 8th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gauss (unit)
The gauss, symbol (sometimes Gs), is a unit of measurement of magnetic induction, also known as ''magnetic flux density''. The unit is part of the Gaussian system of units, which inherited it from the older CGS-EMU system. It was named after the German mathematician and physicist Carl Friedrich Gauss in 1936. One gauss is defined as one maxwell per square centimetre. As the cgs system has been superseded by the International System of Units (SI), the use of the gauss has been deprecated by the standards bodies, but is still regularly used in various subfields of science. The SI unit for magnetic flux density is the tesla (symbol T), which corresponds to . Name, symbol, and metric prefixes Albeit not a component of the International System of Units, the usage of the gauss generally follows the rules for SI units. Since the name is derived from a person's name, its symbol is the uppercase letter ''G''. When the unit is spelled out, it is written in lowercase ("gauss"), unless ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
