|
GRB 970508
GRB 970508 was a gamma-ray burst (GRB) detected on May 8, 1997, at 21:42 UTC; it is historically important as the second GRB (after GRB 970228) with a detected afterglow at other wavelengths, the first to have a direct redshift measurement of the afterglow, and the first to be detected at radio wavelengths. A gamma-ray burst is a highly luminous flash associated with an explosion in a distant galaxy and producing gamma rays, the most energetic form of electromagnetic radiation, and often followed by a longer-lived "afterglow" emitted at longer wavelengths (X-ray, ultraviolet, optical, infrared, and radio). GRB 970508 was detected by the Gamma Ray Burst Monitor on the Italian–Dutch X-ray astronomy satellite BeppoSAX. Astronomer Mark Metzger determined that GRB 970508 occurred at least 6 billion light years from Earth; this was the first measurement of the distance to a gamma-ray burst. Until this burst, astronomers had not reached a consensus r ... [...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] |
Pian , ethnomusicologist and scholar of Chinese language.
* Pians also refers to seminarians and alumni of St. Pius X Seminary and Pian may refer to: * Pian (disease), a tropical infection of the skin, bones and joints * Pian-e Olya, a village in Khuzestan Province, Iran * Pian-e Sofla, a village in Khuzestan Province, Iran * Pian Rural District, in Khuzestan Province, Iran * Pian Camuno, a commune in the province of Brescia, in Lombardy, Italy * Pian di Scò, a commune in the province of Arezzo, in Tuscany, Italy * Pian, Uganda, a county of Moroto District, in Uganda * Rulan Chao Pian Rulan Chao Pian (née Rulan Chao; April 20, 1922 November 30, 2013), [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ulysses (spacecraft)
''Ulysses'' ( , ) was a Uncrewed spacecraft, robotic space probe whose primary mission was to orbit the Sun and study it at all latitudes. It was launched in 1990 and made three "fast latitude scans" of the Sun in 1994/1995, 2000/2001, and 2007/2008. In addition, the probe studied several comets. ''Ulysses'' was a joint venture of the European Space Agency (ESA) and the United States' NASA, National Aeronautics and Space Administration (NASA), under leadership of ESA with participation from Canada's National Research Council (Canada), National Research Council. The last day for mission operations on ''Ulysses'' was 30 June 2009. To study the Sun at all latitudes, the probe needed to change its orbital inclination and leave the Ecliptic, plane of the Solar System. To change the orbital inclination of a spacecraft to about 80° requires a large change in heliocentric velocity, the energy to achieve which far exceeded the capabilities of any launch vehicle. To reach the desired ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pedersen
Pedersen () is a Danish and Norwegian patronymic surname, literally meaning "son of Peder". It is the fifth most common surname in Denmark, shared by about 3.4% of the population, and the sixth most common in Norway. It is of similar origin as the surname Petersen. Listing of people with the surname Pedersen * Aaron Pedersen (born 1970), Australian actor of Arrente/Arabana descent * Abdul Wahid Pedersen (born 1954), Danish Imam * Alexander Pedersen (1891–1955), Norwegian sprinter * Alex Pedersen (cyclist) (born 1966), Danish cyclist * Alf Pedersen (1904–1925), Norwegian boxer * Allen Pedersen (born 1965), Canadian retired professional ice hockey player * Alma Pedersen (born 2005), Danish rhythmic gymnast * Anne Rygh Pedersen (born 1967), Norwegian politician for the Labour Party * Bente Pedersen (born 1961), Norwegian novelist * Bent-Ove Pedersen (born 1967), Norwegian tennis player * Bernard E. Pedersen, American politician * Bjarne Bent Rønne Pedersen (1935–1993), Danish m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Costa
Costa may refer to: Biology * Rib (Latin: ''costa''), in vertebrate anatomy * Costa (botany), the central strand of a plant leaf or thallus * Costa (coral), a stony rib, part of the skeleton of a coral * Costa (entomology), the leading edge of the forewing of winged insects, as well as a part of the male clasper Arts and entertainment * ''Costa!'', a 2001 Dutch film * ''Costa!!'', a 2022 Dutch film * Costa Book Awards, formerly the Whitbread Book Award, a literary award in the UK Organisations * Costa Caribe, a Nicaraguan basketball team * Costa Coffee, a British coffee shop chain, sponsor of the book award * Costa Cruises, a leading cruise company in Europe * Costa Del Mar, an American manufacturer of polarized sunglasses * Costa Group, Australian food supplier Places * Costa, Haute-Corse, France, a commune on the island of Corsica * Costa, Lajas, Puerto Rico, a barrio * Costa, West Virginia, US, or Brushton, a community * Costa Head, a headland on the Orkney Islands * Departam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radio
Radio is the technology of communicating using radio waves. Radio waves are electromagnetic waves of frequency between 3 hertz (Hz) and 300 gigahertz (GHz). They are generated by an electronic device called a transmitter connected to an antenna which radiates the waves. They can be received by other antennas connected to a radio receiver; this is the fundamental principle of radio communication. In addition to communication, radio is used for radar, radio navigation, remote control, remote sensing, and other applications. In radio communication, used in radio and television broadcasting, cell phones, two-way radios, wireless networking, and satellite communication, among numerous other uses, radio waves are used to carry information across space from a transmitter to a receiver, by modulating the radio signal (impressing an information signal on the radio wave by varying some aspect of the wave) in the transmitter. In radar, used to locate and track ob ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Optical
Optics is the branch of physics that studies the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it. Optics usually describes the behaviour of visible, ultraviolet, and infrared light. Light is a type of electromagnetic radiation, and other forms of electromagnetic radiation such as X-rays, microwaves, and radio waves exhibit similar properties. Most optical phenomena can be accounted for by using the classical electromagnetic description of light, however complete electromagnetic descriptions of light are often difficult to apply in practice. Practical optics is usually done using simplified models. The most common of these, geometric optics, treats light as a collection of rays that travel in straight lines and bend when they pass through or reflect from surfaces. Physical optics is a more comprehensive model of light, which includes wave effects such as diffraction and interference that can ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Schilling
Schilling may refer to: * Schilling (unit), an historical unit of measurement * Schilling (coin), the historical European coin ** Shilling, currency historically used in Europe and currently used in the East African Community ** Austrian schilling The schilling (German language, German: ''Schilling''; ) is a former currency of Austria from 1925 to 1938 and from 1945 to 1999, and the circulating currency until 2002. The euro was introduced at a fixed parity of €1 = 13.7603 schilling t ..., the former currency of Austria * Schilling rudder, a type of rudder allowing extra manoeuvrability * A. Schilling & Company, an historical West Coast spice firm acquired in 1948 by McCormick & Company * Schilling Air Force Base * Schilling Power Station, an oil-fired power station near the nuclear power station at Stade, Germany * Schilling of Solothurn, a family of two Swiss chroniclers * The Schilling School for Gifted Children, a K-12 school in Cincinnati, Ohio People * Schilling ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vela Satellites
Vela was the name of a group of reconnaissance satellites developed as the Vela Hotel element of Project Vela by the United States to detect nuclear detonations and monitor Soviet Union compliance with the 1963 Partial Test Ban Treaty. Vela started out as a small budget research program in 1959. It ended 26 years later as a successful, cost-effective military space system, which also provided scientific data on natural sources of space radiation. In the 1970s, the nuclear detection mission was taken over by the Defense Support Program (DSP) satellites. In the late 1980s, it was augmented by the Navstar Global Positioning System (GPS) satellites. The program is now called the Integrated Operational NuDet (Nuclear Detonation) Detection System ( IONDS). Deployment Twelve satellites were built, six of the Vela Hotel design and six of the Advanced Vela design. The Vela Hotel series was to detect nuclear tests in space, while the Advanced Vela series was to detect not only nuclear ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theory Of Relativity
The theory of relativity usually encompasses two interrelated physics theories by Albert Einstein: special relativity and general relativity, proposed and published in 1905 and 1915, respectively. Special relativity applies to all physical phenomena in the absence of gravity. General relativity explains the law of gravitation and its relation to the forces of nature. It applies to the cosmological and astrophysical realm, including astronomy. The theory transformed theoretical physics and astronomy during the 20th century, superseding a 200-year-old theory of mechanics created primarily by Isaac Newton. It introduced concepts including 4-dimensional spacetime as a unified entity of space and time, relativity of simultaneity, kinematic and gravitational time dilation, and length contraction. In the field of physics, relativity improved the science of elementary particles and their fundamental interactions, along with ushering in the nuclear age. With relativity, cosmolog ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Speed Of Light
The speed of light in vacuum, commonly denoted , is a universal physical constant exactly equal to ). It is exact because, by international agreement, a metre is defined as the length of the path travelled by light in vacuum during a time interval of second. The speed of light is invariant (physics), the same for all observers, no matter their relative velocity. It is the upper limit for the speed at which Information#Physics_and_determinacy, information, matter, or energy can travel through Space#Relativity, space. All forms of electromagnetic radiation, including visible light, travel at the speed of light. For many practical purposes, light and other electromagnetic waves will appear to propagate instantaneously, but for long distances and sensitive measurements, their finite speed has noticeable effects. Much starlight viewed on Earth is from the distant past, allowing humans to study the history of the universe by viewing distant objects. When Data communication, comm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
