An all-star team is a group of people all having a high level of performance in their field. Originating in sports, it has since drifted into vernacular and has been borrowed heavily by the entertainment industry .
97-443: "All-star" as a sports term refers to individual players named to an "all-star" roster or team representing the top performers (members of such a team were all stars from other teams) during and before the end of a season in a given sport, or to a list of top participants who played in individual sports such as golf and bowling . Events limited to such honorees are referred to as "all-star games" or events. In American team sports
194-456: A protoplanetary disk and powered mainly by the conversion of gravitational energy. The period of gravitational contraction lasts about 10 million years for a star like the sun, up to 100 million years for a red dwarf. Early stars of less than 2 M ☉ are called T Tauri stars , while those with greater mass are Herbig Ae/Be stars . These newly formed stars emit jets of gas along their axis of rotation, which may reduce
291-467: A stellar wind of particles that causes a continual outflow of gas into space. For most stars, the mass lost is negligible. The Sun loses 10 M ☉ every year, or about 0.01% of its total mass over its entire lifespan. However, very massive stars can lose 10 to 10 M ☉ each year, significantly affecting their evolution. Stars that begin with more than 50 M ☉ can lose over half their total mass while on
388-656: A UK number-one hit with the collaged " Pump up the Volume " by M|A|R|R|S (licensed to 4th & B'Way /Island Records in the US). In the 1990s, 4AD established an office in Los Angeles and had success with bands such as The Breeders , Belly , Red House Painters , Unrest and His Name Is Alive , as well as solo material by Frank Black and Kristin Hersh . The label's deal with Warner Bros. Records in
485-487: A brief period of carbon fusion before the core becomes degenerate. During the AGB phase, stars undergo thermal pulses due to instabilities in the core of the star. In these thermal pulses, the luminosity of the star varies and matter is ejected from the star's atmosphere, ultimately forming a planetary nebula. As much as 50 to 70% of a star's mass can be ejected in this mass loss process. Because energy transport in an AGB star
582-496: A burst of electron capture and inverse beta decay . The shockwave formed by this sudden collapse causes the rest of the star to explode in a supernova. Supernovae become so bright that they may briefly outshine the star's entire home galaxy. When they occur within the Milky Way, supernovae have historically been observed by naked-eye observers as "new stars" where none seemingly existed before. A supernova explosion blows away
679-410: A continuous image due to the effect of refraction from sublunary material, citing his observation of the conjunction of Jupiter and Mars on 500 AH (1106/1107 AD) as evidence. Early European astronomers such as Tycho Brahe identified new stars in the night sky (later termed novae ), suggesting that the heavens were not immutable. In 1584, Giordano Bruno suggested that the stars were like
776-440: A difference between " fixed stars ", whose position on the celestial sphere does not change, and "wandering stars" ( planets ), which move noticeably relative to the fixed stars over days or weeks. Many ancient astronomers believed that the stars were permanently affixed to a heavenly sphere and that they were immutable. By convention, astronomers grouped prominent stars into asterisms and constellations and used them to track
873-518: A much larger gravitationally bound structure, such as a star cluster or a galaxy. The word "star" ultimately derives from the Proto-Indo-European root "h₂stḗr" also meaning star, but further analyzable as h₂eh₁s- ("to burn", also the source of the word "ash") + -tēr (agentive suffix). Compare Latin stella , Greek aster , German Stern . Some scholars believe the word is a borrowing from Akkadian " istar " ( Venus ). "Star"
970-546: A net release of energy. Some massive stars, particularly luminous blue variables , are very unstable to the extent that they violently shed their mass into space in events supernova impostors , becoming significantly brighter in the process. Eta Carinae is known for having underwent a supernova impostor event, the Great Eruption, in the 19th century. As a star's core shrinks, the intensity of radiation from that surface increases, creating such radiation pressure on
1067-463: A series of star maps and applied Greek letters as designations to the stars in each constellation. Later a numbering system based on the star's right ascension was invented and added to John Flamsteed 's star catalogue in his book "Historia coelestis Britannica" (the 1712 edition), whereby this numbering system came to be called Flamsteed designation or Flamsteed numbering . The internationally recognized authority for naming celestial bodies
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#17327728743031164-614: A set of nominal solar values (defined as SI constants, without uncertainties) which can be used for quoting stellar parameters: The solar mass M ☉ was not explicitly defined by the IAU due to the large relative uncertainty ( 10 ) of the Newtonian constant of gravitation G . Since the product of the Newtonian constant of gravitation and solar mass together ( G M ☉ ) has been determined to much greater precision,
1261-499: A star begins with gravitational instability within a molecular cloud, caused by regions of higher density—often triggered by compression of clouds by radiation from massive stars, expanding bubbles in the interstellar medium, the collision of different molecular clouds, or the collision of galaxies (as in a starburst galaxy ). When a region reaches a sufficient density of matter to satisfy the criteria for Jeans instability , it begins to collapse under its own gravitational force. As
1358-434: A star of more than 9 solar masses expands to form first a blue supergiant and then a red supergiant . Particularly massive stars (exceeding 40 solar masses, like Alnilam , the central blue supergiant of Orion's Belt ) do not become red supergiants due to high mass loss. These may instead evolve to a Wolf–Rayet star , characterised by spectra dominated by emission lines of elements heavier than hydrogen, which have reached
1455-407: A white dwarf is no longer a plasma. Eventually, white dwarfs fade into black dwarfs over a very long period of time. In massive stars, fusion continues until the iron core has grown so large (more than 1.4 M ☉ ) that it can no longer support its own mass. This core will suddenly collapse as its electrons are driven into its protons, forming neutrons, neutrinos , and gamma rays in
1552-708: Is also used in films, often used as a form of publicity gimmick to promote the cast of a movie in which a number of high-profile actors appear, sometimes merely in cameo roles. An archetype is the 1956 version of Around the World in 80 Days . In a similar vein to sporting events, some reality television franchises (such as Dancing with the Stars , Survivor , and RuPaul's Drag Race ) have held all star seasons featuring notable contestants from previous seasons, such as champions, contestants popular among viewers, and notable contestants from international versions of
1649-420: Is cognate (shares the same root) with the following words: asterisk , asteroid , astral , constellation , Esther . Historically, stars have been important to civilizations throughout the world. They have been part of religious practices, divination rituals, mythology , used for celestial navigation and orientation, to mark the passage of seasons, and to define calendars. Early astronomers recognized
1746-466: Is not equivalent to supergroup , which refers to a group made of already established musicians from other popular bands or with a successful solo career. The All Star DC Comics was an imprint of ongoing American comic book titles published by DC Comics that ran from 2005 to 2008. DC has published two titles under the All-Star banner, featuring Batman and Superman . The premise of the imprint
1843-409: Is primarily by convection , this ejected material is enriched with the fusion products dredged up from the core. Therefore, the planetary nebula is enriched with elements like carbon and oxygen. Ultimately, the planetary nebula disperses, enriching the general interstellar medium. Therefore, future generations of stars are made of the "star stuff" from past stars. During their helium-burning phase,
1940-509: Is referred to record labels or a music genre's top musical artists. An example of this includes the single " Pow 2011 " by Lethal Bizzle in which all the featured artists are credited as " Grime All-Stars". Sometimes, labels organize such all-star sessions to release dedicated albums. Examples of this case are the collective This Mortal Coil under the 4AD label, or the Roadrunner United sessions by Roadrunner Records . The term
2037-552: Is that it made it seem like 4AD had hundreds of releases early on. In the 1990s, 4AD changed the first part of the number from "100s" to "1000s," temporarily making the number not correspond with the number of years since 1980. Releases in 1990 used "00" directly after the prefix (e.g., the Pixies ' Bossanova , CAD0010, released in the fall of 1990); 1991 used "10" directly after the prefix (e.g., This Mortal Coil's Blood , DAD 1005, released early in 1991), 1992 used "20," and so on for
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#17327728743032134-575: Is the International Astronomical Union (IAU). The International Astronomical Union maintains the Working Group on Star Names (WGSN) which catalogs and standardizes proper names for stars. A number of private companies sell names of stars which are not recognized by the IAU, professional astronomers, or the amateur astronomy community. The British Library calls this an unregulated commercial enterprise , and
2231-491: Is the Orion Nebula . Most stars form in groups of dozens to hundreds of thousands of stars. Massive stars in these groups may powerfully illuminate those clouds, ionizing the hydrogen, and creating H II regions . Such feedback effects, from star formation, may ultimately disrupt the cloud and prevent further star formation. All stars spend the majority of their existence as main sequence stars , fueled primarily by
2328-679: Is the annual Senior Bowl which pits the best senior College Football players in the country against one another. These players generally go on to be drafted in the NFL Draft in April. In gaelic games , the term "all-stars" refers to the GAA GPA All Stars Awards . These awards involve picking a fantasy team consisting of the top players in each position in the various sports ( Gaelic football , Ladies' Gaelic football , hurling , rounders and camogie ). The term "all star"
2425-543: The Algol paradox , where the most-evolved star in a system is the least massive. 4AD 4AD is a British record label owned by Beggars Group . It was founded in London under the name Axis Records by Ivo Watts-Russell and Peter Kent in 1980 as an imprint of Beggars Banquet Records . The name was changed to 4AD after the release of the label's first four singles. Later that year, Watts-Russell and Kent purchased
2522-701: The M87 and M100 galaxies of the Virgo Cluster , as well as luminous stars in some other relatively nearby galaxies. With the aid of gravitational lensing , a single star (named Icarus ) has been observed at 9 billion light-years away. The concept of a constellation was known to exist during the Babylonian period. Ancient sky watchers imagined that prominent arrangements of stars formed patterns, and they associated these with particular aspects of nature or their myths. Twelve of these formations lay along
2619-575: The New York City Department of Consumer and Worker Protection issued a violation against one such star-naming company for engaging in a deceptive trade practice. Although stellar parameters can be expressed in SI units or Gaussian units , it is often most convenient to express mass , luminosity , and radii in solar units, based on the characteristics of the Sun. In 2015, the IAU defined
2716-461: The angular momentum of the collapsing star and result in small patches of nebulosity known as Herbig–Haro objects . These jets, in combination with radiation from nearby massive stars, may help to drive away the surrounding cloud from which the star was formed. Early in their development, T Tauri stars follow the Hayashi track —they contract and decrease in luminosity while remaining at roughly
2813-404: The franchise . These can include entire seasons where the alumni compete against each other, or a spin-off competition with a different format. One such example— Survivor: Winners at War —was intended to celebrate the 40th season of the U.S. version , and featured 20 winners from past seasons competing for a cash prize of $ 2,000,000. Most of its challenges were also reprised from the seasons that
2910-632: The interstellar medium . These elements are then recycled into new stars. Astronomers can determine stellar properties—including mass, age, metallicity (chemical composition), variability , distance , and motion through space —by carrying out observations of a star's apparent brightness , spectrum , and changes in its position in the sky over time. Stars can form orbital systems with other astronomical objects, as in planetary systems and star systems with two or more stars. When two such stars orbit closely, their gravitational interaction can significantly impact their evolution. Stars can form part of
3007-453: The photographic magnitude . The development of the photoelectric photometer allowed precise measurements of magnitude at multiple wavelength intervals. In 1921 Albert A. Michelson made the first measurements of a stellar diameter using an interferometer on the Hooker telescope at Mount Wilson Observatory . Important theoretical work on the physical structure of stars occurred during
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3104-555: The thermonuclear fusion of hydrogen into helium in its core. This process releases energy that traverses the star's interior and radiates into outer space . At the end of a star's lifetime as a fusor , its core becomes a stellar remnant : a white dwarf , a neutron star , or—if it is sufficiently massive—a black hole . Stellar nucleosynthesis in stars or their remnants creates almost all naturally occurring chemical elements heavier than lithium . Stellar mass loss or supernova explosions return chemically enriched material to
3201-591: The 11th century, the Persian polymath scholar Abu Rayhan Biruni described the Milky Way galaxy as a multitude of fragments having the properties of nebulous stars, and gave the latitudes of various stars during a lunar eclipse in 1019. According to Josep Puig, the Andalusian astronomer Ibn Bajjah proposed that the Milky Way was made up of many stars that almost touched one another and appeared to be
3298-476: The 2015 IAU nominal constants will remain the same SI values as they remain useful measures for quoting stellar parameters. Large lengths, such as the radius of a giant star or the semi-major axis of a binary star system, are often expressed in terms of the astronomical unit —approximately equal to the mean distance between the Earth and the Sun (150 million km or approximately 93 million miles). In 2012,
3395-461: The 4AD label. Bands including The National were moved to 4AD as a part of this merger. In 2009, the label released, amongst others, St. Vincent 's second record Actor (CAD 2919) and Camera Obscura 's My Maudlin Career . The following year, 4AD saw the release of The National 's High Violet and acclaimed albums from Ariel Pink's Haunted Graffiti , Blonde Redhead and Deerhunter . In
3492-674: The Beggars Group. The label's history was detailed by Martin Aston in the book Facing The Other Way , released in 2013. Ivo Watts-Russell and Peter Kent, employees of the Beggars Banquet record store and label, founded Axis Records (named after the Jimi Hendrix album ) in late 1979 as a property of Beggars Banquet, that was run by the two of them. After the first four Axis singles in early 1980, it became apparent that
3589-413: The IAU defined the astronomical constant to be an exact length in meters: 149,597,870,700 m. Stars condense from regions of space of higher matter density, yet those regions are less dense than within a vacuum chamber . These regions—known as molecular clouds —consist mostly of hydrogen, with about 23 to 28 percent helium and a few percent heavier elements. One example of such a star-forming region
3686-413: The IAU defined the nominal solar mass parameter to be: The nominal solar mass parameter can be combined with the most recent (2014) CODATA estimate of the Newtonian constant of gravitation G to derive the solar mass to be approximately 1.9885 × 10 kg . Although the exact values for the luminosity, radius, mass parameter, and mass may vary slightly in the future due to observational uncertainties,
3783-497: The Solar System, Isaac Newton suggested that the stars were equally distributed in every direction, an idea prompted by the theologian Richard Bentley . The Italian astronomer Geminiano Montanari recorded observing variations in luminosity of the star Algol in 1667. Edmond Halley published the first measurements of the proper motion of a pair of nearby "fixed" stars, demonstrating that they had changed positions since
3880-439: The Sun enters the helium burning phase, it will expand to a maximum radius of roughly 1 astronomical unit (150 million kilometres), 250 times its present size, and lose 30% of its current mass. As the hydrogen-burning shell produces more helium, the core increases in mass and temperature. In a red giant of up to 2.25 M ☉ , the mass of the helium core becomes degenerate prior to helium fusion . Finally, when
3977-449: The Sun, and may have other planets , possibly even Earth-like, in orbit around them, an idea that had been suggested earlier by the ancient Greek philosophers , Democritus and Epicurus , and by medieval Islamic cosmologists such as Fakhr al-Din al-Razi . By the following century, the idea of the stars being the same as the Sun was reaching a consensus among astronomers. To explain why these stars exerted no net gravitational pull on
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4074-508: The United States in 1992 would start the beginning of a new phase in 4AD history. New signings that year included American underground acts Kendra Smith , Tarnation , Air Miami and The Amps . The following year Watts-Russell started a sub-label, Guernica , which would release records by Unrest , That Dog , and Bettie Serveert . In 1999, Watts-Russell sold his share in 4AD back to the Beggars Group (as it had by then become), but
4171-502: The band of the ecliptic and these became the basis of astrology . Many of the more prominent individual stars were given names, particularly with Arabic or Latin designations. As well as certain constellations and the Sun itself, individual stars have their own myths . To the Ancient Greeks , some "stars", known as planets (Greek πλανήτης (planētēs), meaning "wanderer"), represented various important deities, from which
4268-616: The brightest stars have proper names . Astronomers have assembled star catalogues that identify the known stars and provide standardized stellar designations . The observable universe contains an estimated 10 to 10 stars. Only about 4,000 of these stars are visible to the naked eye—all within the Milky Way galaxy . A star's life begins with the gravitational collapse of a gaseous nebula of material largely comprising hydrogen , helium, and trace heavier elements. Its total mass mainly determines its evolution and eventual fate. A star shines for most of its active life due to
4365-531: The cast members had originally competed in. Sometimes, all-star crossovers may be organized between contestants of multiple reality formats; the MTV series The Challenge was originally a competition spin-off of its reality shows The Real World and Road Rules , but later seasons began to increasingly include alumni from other popular reality series such as The Amazing Race , Big Brother , RuPaul's Drag Race , and Survivor . "All-stars" in music terms
4462-502: The chemical composition of the stellar atmosphere to be determined. With the exception of rare events such as supernovae and supernova impostors , individual stars have primarily been observed in the Local Group , and especially in the visible part of the Milky Way (as demonstrated by the detailed star catalogues available for the Milky Way galaxy) and its satellites. Individual stars such as Cepheid variables have been observed in
4559-408: The cloud collapses, individual conglomerations of dense dust and gas form " Bok globules ". As a globule collapses and the density increases, the gravitational energy converts into heat and the temperature rises. When the protostellar cloud has approximately reached the stable condition of hydrostatic equilibrium , a protostar forms at the core. These pre-main-sequence stars are often surrounded by
4656-612: The cloud into multiple stars distributes some of that angular momentum. The primordial binaries transfer some angular momentum by gravitational interactions during close encounters with other stars in young stellar clusters. These interactions tend to split apart more widely separated (soft) binaries while causing hard binaries to become more tightly bound. This produces the separation of binaries into their two observed populations distributions. Stars spend about 90% of their lifetimes fusing hydrogen into helium in high-temperature-and-pressure reactions in their cores. Such stars are said to be on
4753-400: The core. The blown-off outer layers of dying stars include heavy elements, which may be recycled during the formation of new stars. These heavy elements allow the formation of rocky planets. The outflow from supernovae and the stellar wind of large stars play an important part in shaping the interstellar medium. Binary stars ' evolution may significantly differ from that of single stars of
4850-463: The deal ended, he offered to sell the label back to Beggars Banquet. Dead Can Dance's output, however, stayed with Warner Bros. until the sale back to Beggars Group. The deal with Beggars Banquet was completed by early 1999, and since then it has owned 4AD and its distribution worldwide. This led to many negotiations for the label's back catalogue, like getting back American distribution rights for Pixies , Dead Can Dance and Cocteau Twins . In 2013,
4947-417: The direction of the Milky Way core . His son John Herschel repeated this study in the southern hemisphere and found a corresponding increase in the same direction. In addition to his other accomplishments, William Herschel is noted for his discovery that some stars do not merely lie along the same line of sight, but are physical companions that form binary star systems. The science of stellar spectroscopy
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#17327728743035044-482: The early months of 2017. The catalogue numbers of all releases since April 2017 (beginning with The Far Field by Future Islands , 4AD0001CD/4AD0001LP) have begun with 4AD00 nn and ended with letters indicating the release format. No indication of release year is given. The 4AD Sessions are an ongoing series of video recordings with various acts from the label's roster. Following on from the Deerhunter session at
5141-405: The end of the star's life, fusion continues along a series of onion-layer shells within a massive star. Each shell fuses a different element, with the outermost shell fusing hydrogen; the next shell fusing helium, and so forth. The final stage occurs when a massive star begins producing iron. Since iron nuclei are more tightly bound than any heavier nuclei, any fusion beyond iron does not produce
5238-526: The first decades of the twentieth century. In 1913, the Hertzsprung-Russell diagram was developed, propelling the astrophysical study of stars. Successful models were developed to explain the interiors of stars and stellar evolution. Cecilia Payne-Gaposchkin first proposed that stars were made primarily of hydrogen and helium in her 1925 PhD thesis. The spectra of stars were further understood through advances in quantum physics . This allowed
5335-411: The first two digits of the number representing the years since 1980 (e.g., Blonde Redhead 's 23 , CAD 27 17, released in 2007; the 27 th year since 1980). Things have not been too consistent since, and there have been several gaps. 2010 releases feature the numerical designation 3X, as "30" had already been used in 1993. This process appears to have come to an end with the few x AD37 nn releases of
5432-473: The label continued to release music and add new artists to its roster. Simon Halliday took control of the label at the end of 2007. Immediate successes were Bon Iver 's critically lauded debut For Emma, Forever Ago (CAD 2809) and Dear Science by Brooklyn's TV on the Radio (CAD 2821). In 2008, the Beggars Group re-aligned itself so that several labels, including Beggars Banquet itself, were folded up on to
5529-454: The label from Beggars Banquet to become an independent record label , and Kent sold his share to Watts-Russell a year later. The label gained prominence in the 1980s for releasing albums from alternative rock , post-punk , gothic rock , and dream pop artists, such as Bauhaus , Cocteau Twins , Modern English , Dead Can Dance , Clan of Xymox , Pixies , Throwing Muses , and Watts-Russell's own musical project This Mortal Coil . In 1987,
5626-422: The label outright. The two were the sole owners for about a year. Kent sold his share to Watts-Russell at the end of 1981, and started a new Beggars Banquet subsidiary, Situation Two Records . Watts-Russell would maintain ownership of the label, and act as its president, until the late 1990s. Watts-Russell invited the graphic designer Vaughan Oliver and the photographer Nigel Grierson to create sleeve art for
5723-616: The label released Bills & Aches & Blues , a compilation album featuring bands from 4AD covering songs the label had released over its 40 years. While 4AD did not handle any distribution outside the United Kingdom for many years, it had many willing distributors in many countries; Virgin Records for France, Nippon Columbia distributed much of the label in Japan, while PolyGram subsidiary Vertigo Records released many of
5820-604: The label scored an international hit with the dance music single " Pump Up the Volume " by the one-off project M|A|R|R|S . 4AD continued to have success in the 1990s and 2000s, with releases from The Breeders , Lush , Belly , Red House Painters , Camera Obscura , TV on the Radio , St. Vincent , and Bon Iver . As of January 2022 , the label's current roster includes acts such as Dry Cleaning , The National , Daughter , Deerhunter , Big Thief , Aldous Harding , U.S. Girls , Erika de Casier , and Future Islands . In 1999, Watts-Russell sold 4AD back to
5917-500: The label's records in Canada. The USA had always been a tough market for 4AD, even though its records sold well there as imports. Only a few of the label's acts had deals to license their recordings in the US, among various labels. In 1992, Watts-Russell signed a five-year distribution deal with Warner Bros. Records so that nearly all 4AD releases would be released in the United States. When
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#17327728743036014-557: The label, and as a result, 4AD acquired a visually distinctive identity. Its artists, such as Cocteau Twins and Dead Can Dance , developed cult followings in the mid-1980s, but 4AD continued to evolve, and, after signing Throwing Muses and Pixies , the label increasingly concentrated on underground American rock music. In 1983, 4AD had a minor hit in America with the Modern English single " I Melt With You ". In 1987, 4AD had
6111-437: The main sequence and are called dwarf stars. Starting at zero-age main sequence, the proportion of helium in a star's core will steadily increase, the rate of nuclear fusion at the core will slowly increase, as will the star's temperature and luminosity. The Sun, for example, is estimated to have increased in luminosity by about 40% since it reached the main sequence 4.6 billion ( 4.6 × 10 ) years ago. Every star generates
6208-677: The main sequence. The time a star spends on the main sequence depends primarily on the amount of fuel it has and the rate at which it fuses it. The Sun is expected to live 10 billion ( 10 ) years. Massive stars consume their fuel very rapidly and are short-lived. Low mass stars consume their fuel very slowly. Stars less massive than 0.25 M ☉ , called red dwarfs , are able to fuse nearly all of their mass while stars of about 1 M ☉ can only fuse about 10% of their mass. The combination of their slow fuel-consumption and relatively large usable fuel supply allows low mass stars to last about one trillion ( 10 × 10 ) years;
6305-412: The main sequence. Besides mass, the elements heavier than helium can play a significant role in the evolution of stars. Astronomers label all elements heavier than helium "metals", and call the chemical concentration of these elements in a star, its metallicity . A star's metallicity can influence the time the star takes to burn its fuel, and controls the formation of its magnetic fields, which affects
6402-456: The most extreme of 0.08 M ☉ will last for about 12 trillion years. Red dwarfs become hotter and more luminous as they accumulate helium. When they eventually run out of hydrogen, they contract into a white dwarf and decline in temperature. Since the lifespan of such stars is greater than the current age of the universe (13.8 billion years), no stars under about 0.85 M ☉ are expected to have moved off
6499-480: The most part, 4AD's official UK releases follow a standard scheme for designating catalogue numbers. Although there have been some variations over the years, some general rules can be devised to easily determine the format (LP, CD, etc.) and year of release by looking at a 4AD catalog number. The first part of a catalogue number is a prefix that contains a variation of "AD," based on the 4AD name. Some standards are: Special editions of releases had an extra "D" added to
6596-445: The motions of the planets and the inferred position of the Sun. The motion of the Sun against the background stars (and the horizon) was used to create calendars , which could be used to regulate agricultural practices. The Gregorian calendar , currently used nearly everywhere in the world, is a solar calendar based on the angle of the Earth's rotational axis relative to its local star, the Sun. The oldest accurately dated star chart
6693-532: The music historian Martin Aston wrote in Facing the Other Way: The Story of 4AD : The attention to cataloguing aided the collectability of 4AD (the prefixes extended to DAD, GAD and HAD). It was all part of the bespoke detail that set independent labels apart from the majors. It created an identifiable culture that had grown big enough to support its own distribution system and trade magazine. For
6790-513: The name Axis was already being used by another music company and the name was changed to 4AD, an abbreviation of the word forward. Other names which they had considered included 1980AD, 4WD and 1984. An initial idea for the label was that it would be a "testing ground" for Beggars Banquet; successful acts would graduate up to Beggars Banquet after a year at 4AD. The only band to follow this path would be Bauhaus , who were signed to Beggars Banquet in late 1980, before Watts-Russell and Kent purchased
6887-484: The names of the planets Mercury , Venus , Mars , Jupiter and Saturn were taken. ( Uranus and Neptune were Greek and Roman gods , but neither planet was known in Antiquity because of their low brightness. Their names were assigned by later astronomers.) Circa 1600, the names of the constellations were used to name the stars in the corresponding regions of the sky. The German astronomer Johann Bayer created
6984-435: The next three years, 4AD oversaw new releases from Scott Walker , Bon Iver , Iron & Wine , and Tune-Yards , whilst also expanded its roster with a number of beats and electronic acts in the shape of acts including Purity Ring and Grimes , with the latter releasing one of the best received albums of 2012. Additional signings to the label include bEEdEEgEE, of Gang Gang Dance , Lo-Fang , and British producer SOHN . At
7081-403: The nuclear fusion of hydrogen into helium within their cores. However, stars of different masses have markedly different properties at various stages of their development. The ultimate fate of more massive stars differs from that of less massive stars, as do their luminosities and the impact they have on their environment. Accordingly, astronomers often group stars by their mass: The formation of
7178-417: The outer convective envelope collapses and the star then moves to the horizontal branch. After a star has fused the helium of its core, it begins fusing helium along a shell surrounding the hot carbon core. The star then follows an evolutionary path called the asymptotic giant branch (AGB) that parallels the other described red-giant phase, but with a higher luminosity. The more massive AGB stars may undergo
7275-404: The outer shell of gas that it will push those layers away, forming a planetary nebula. If what remains after the outer atmosphere has been shed is less than roughly 1.4 M ☉ , it shrinks to a relatively tiny object about the size of Earth, known as a white dwarf . White dwarfs lack the mass for further gravitational compression to take place. The electron-degenerate matter inside
7372-456: The particular year. For example, This Mortal Coil 's LP It'll End in Tears is CAD 411. The "CAD" represents that the release is an LP, the "4" in 411 represents 1984, and 11 marks the 11th release of that year. This is the vinyl LP release; cassette versions have "C" added to the prefix (CADC 411 in this example); CD versions have "CD" added at the end (CAD 411CD). A side effect of this scheme
7469-664: The positions of the stars. They built the first large observatory research institutes, mainly to produce Zij star catalogues. Among these, the Book of Fixed Stars (964) was written by the Persian astronomer Abd al-Rahman al-Sufi , who observed a number of stars, star clusters (including the Omicron Velorum and Brocchi's Clusters ) and galaxies (including the Andromeda Galaxy ). According to A. Zahoor, in
7566-422: The prefix: Some other "AD" variations have been used less frequently over the years, including (but not limited to): 4AD only released one LP on DAT format , Cocteau Twins' Blue Bell Knoll , which was designated CADT 807. The second part of the catalogue number is a number that represents the year of release (via the number of years since 1980, following the '1980 Forward' theme), and the order of release in
7663-535: The premier all-star games are the Major League Baseball All-Star Game , NBA All-Star Game (basketball), Pro Bowl (football), NHL All-Star Game (hockey), and MLS All-Star Game (soccer). Many all-star teams, such as collegiate "all-conference" and All-America squads, are recognitions of performance only, without the connotation of those selected ever being teammates in a game. The closest college sports come to an "All-star" game
7760-403: The problem of deriving an orbit of binary stars from telescope observations was made by Felix Savary in 1827. The twentieth century saw increasingly rapid advances in the scientific study of stars. The photograph became a valuable astronomical tool. Karl Schwarzschild discovered that the color of a star and, hence, its temperature, could be determined by comparing the visual magnitude against
7857-497: The proper motion of the star Sirius and inferred a hidden companion. Edward Pickering discovered the first spectroscopic binary in 1899 when he observed the periodic splitting of the spectral lines of the star Mizar in a 104-day period. Detailed observations of many binary star systems were collected by astronomers such as Friedrich Georg Wilhelm von Struve and S. W. Burnham , allowing the masses of stars to be determined from computation of orbital elements . The first solution to
7954-411: The rest of the 1990s. Wanting to return to numbering with the years since 1980, 4AD had to provide a workaround for releases in the year 2000. Since the "20" numerical designation had been used in 1992, all releases in 2000 used "2K" (e.g., Mojave 3 's Excuses for Travellers , CAD 2K05, released in early 2000). Between 2001 and 2009, the catalogue numbering scheme returned to the original format, with
8051-461: The same mass. For example, when any star expands to become a red giant, it may overflow its Roche lobe , the surrounding region where material is gravitationally bound to it; if stars in a binary system are close enough, some of that material may overflow to the other star, yielding phenomena including contact binaries , common-envelope binaries, cataclysmic variables , blue stragglers , and type Ia supernovae . Mass transfer leads to cases such as
8148-455: The same temperature. Less massive T Tauri stars follow this track to the main sequence, while more massive stars turn onto the Henyey track . Most stars are observed to be members of binary star systems, and the properties of those binaries are the result of the conditions in which they formed. A gas cloud must lose its angular momentum in order to collapse and form a star. The fragmentation of
8245-506: The star's outer layers, leaving a remnant such as the Crab Nebula. The core is compressed into a neutron star , which sometimes manifests itself as a pulsar or X-ray burster . In the case of the largest stars, the remnant is a black hole greater than 4 M ☉ . In a neutron star the matter is in a state known as neutron-degenerate matter , with a more exotic form of degenerate matter, QCD matter , possibly present in
8342-425: The start of 2014, the label also announced the additions of Future Islands and Merchandise, followed by D.D Dumbo. In 2015, the label released critically lauded albums by Deerhunter and Grimes, amongst others. The following year, the label and The National landed their first UK No. 1 record with Sleep Well Beast . Latest signings to the roster include Aldous Harding and British band Dry Cleaning. In April 2021,
8439-400: The strength of its stellar wind. Older, population II stars have substantially less metallicity than the younger, population I stars due to the composition of the molecular clouds from which they formed. Over time, such clouds become increasingly enriched in heavier elements as older stars die and shed portions of their atmospheres . As stars of at least 0.4 M ☉ exhaust
8536-485: The supply of hydrogen at their core, they start to fuse hydrogen in a shell surrounding the helium core. The outer layers of the star expand and cool greatly as they transition into a red giant . In some cases, they will fuse heavier elements at the core or in shells around the core. As the stars expand, they throw part of their mass, enriched with those heavier elements, into the interstellar environment, to be recycled later as new stars. In about 5 billion years, when
8633-468: The surface due to strong convection and intense mass loss, or from stripping of the outer layers. When helium is exhausted at the core of a massive star, the core contracts and the temperature and pressure rises enough to fuse carbon (see Carbon-burning process ). This process continues, with the successive stages being fueled by neon (see neon-burning process ), oxygen (see oxygen-burning process ), and silicon (see silicon-burning process ). Near
8730-458: The temperature increases sufficiently, core helium fusion begins explosively in what is called a helium flash , and the star rapidly shrinks in radius, increases its surface temperature, and moves to the horizontal branch of the HR diagram. For more massive stars, helium core fusion starts before the core becomes degenerate, and the star spends some time in the red clump , slowly burning helium, before
8827-400: The time of the ancient Greek astronomers Ptolemy and Hipparchus. William Herschel was the first astronomer to attempt to determine the distribution of stars in the sky. During the 1780s, he established a series of gauges in 600 directions and counted the stars observed along each line of sight. From this, he deduced that the number of stars steadily increased toward one side of the sky, in
8924-435: Was developed by Annie J. Cannon during the early 1900s. The first direct measurement of the distance to a star ( 61 Cygni at 11.4 light-years ) was made in 1838 by Friedrich Bessel using the parallax technique. Parallax measurements demonstrated the vast separation of the stars in the heavens. Observation of double stars gained increasing importance during the 19th century. In 1834, Friedrich Bessel observed changes in
9021-419: Was pioneered by Joseph von Fraunhofer and Angelo Secchi . By comparing the spectra of stars such as Sirius to the Sun, they found differences in the strength and number of their absorption lines —the dark lines in stellar spectra caused by the atmosphere's absorption of specific frequencies. In 1865, Secchi began classifying stars into spectral types . The modern version of the stellar classification scheme
9118-600: Was the SN 1006 supernova, which was observed in 1006 and written about by the Egyptian astronomer Ali ibn Ridwan and several Chinese astronomers. The SN 1054 supernova, which gave birth to the Crab Nebula , was also observed by Chinese and Islamic astronomers. Medieval Islamic astronomers gave Arabic names to many stars that are still used today and they invented numerous astronomical instruments that could compute
9215-614: Was the result of ancient Egyptian astronomy in 1534 BC. The earliest known star catalogues were compiled by the ancient Babylonian astronomers of Mesopotamia in the late 2nd millennium BC, during the Kassite Period ( c. 1531 BC – c. 1155 BC ). The first star catalogue in Greek astronomy was created by Aristillus in approximately 300 BC, with the help of Timocharis . The star catalog of Hipparchus (2nd century BC) included 1,020 stars, and
9312-528: Was to partner DC Comics' top tier characters with the most popular and acclaimed writers and artists. star A star is a luminous spheroid of plasma held together by self-gravity . The nearest star to Earth is the Sun . Many other stars are visible to the naked eye at night ; their immense distances from Earth make them appear as fixed points of light. The most prominent stars have been categorised into constellations and asterisms , and many of
9409-480: Was used to assemble Ptolemy 's star catalogue. Hipparchus is known for the discovery of the first recorded nova (new star). Many of the constellations and star names in use today derive from Greek astronomy. Despite the apparent immutability of the heavens, Chinese astronomers were aware that new stars could appear. In 185 AD, they were the first to observe and write about a supernova , now known as SN 185 . The brightest stellar event in recorded history
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