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José Luis Sérsic
José Luis Sérsic (6 May 1933 – 19 July 1993) was an Argentine astronomer who studied the morphology of galaxies A galaxy is a system of stars, stellar remnants, interstellar gas, dust, dark matter, bound together by gravity. The word is derived from the Greek ' (), literally 'milky', a reference to the Milky Way galaxy that contains the Solar System. .... He is most widely known for the mathematical model of galaxy brightness, the Sersic profile, which bears his name. José Luis Sérsic first published his law in 1963.J. L. Sérsic (1963) Influence of the atmospheric and instrumental dispersion on the brightness distribution in a galaxy/ref> The asteroid 2691 Sersic is named in his honour. References 20th-century Argentine astronomers Argentine people of Croatian descent 1933 births 1993 deaths {{astronomer-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Galaxy
A galaxy is a system of stars, stellar remnants, interstellar gas, dust, dark matter, bound together by gravity. The word is derived from the Greek ' (), literally 'milky', a reference to the Milky Way galaxy that contains the Solar System. Galaxies, averaging an estimated 100 million stars, range in size from dwarfs with less than a hundred million stars, to the largest galaxies known – supergiants with one hundred trillion stars, each orbiting its galaxy's center of mass. Most of the mass in a typical galaxy is in the form of dark matter, with only a few percent of that mass visible in the form of stars and nebulae. Supermassive black holes are a common feature at the centres of galaxies. Galaxies are categorized according to their visual morphology as elliptical, spiral, or irregular. Many are thought to have supermassive black holes at their centers. The Milky Way's central black hole, known as Sagittarius A*, has a mass four million times greater than the Sun. As o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2691 Sersic
__NOTOC__ Year 691 ( DCXCI) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. The denomination 691 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. Events By place Europe * King Theuderic III dies and is succeeded by his son Clovis IV, age 9, as sole ruler of the Franks. He becomes a puppet—a '' roi fainéant''—of his uncle Pepin of Herstal, mayor of the palace of Austrasia. Arabian Empire * Battle of Maskin: An Umayyad army under caliph Abd al-Malik defeats the rebel forces in Mesopotamia (modern Iraq). He reconquers the Arabian Peninsula, taking the holy city of Medina. By topic Architecture * The Dome of the Rock is completed in Jerusalem (under the patronage of Abd al-Malik) during the Second Fitna, becoming the first work of Islamic architecture. Religion * Wilfrid, abbot of Ripon, tries to make himself ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Argentine People Of Croatian Descent
Argentines (mistakenly translated Argentineans in the past; in Spanish (masculine) or (feminine)) are people identified with the country of Argentina. This connection may be residential, legal, historical or cultural. For most Argentines, several (or all) of these connections exist and are collectively the source of their being ''Argentine''. Argentina is a multiethnic and multilingual society, home to people of various ethnic, religious, and national origins, with the majority of the population made up of Old World immigrants and their descendants. As a result, Argentines do not equate their nationality with ethnicity, but with citizenship and allegiance to Argentina. Aside from the indigenous population, nearly all Argentines or their ancestors immigrated within the past five centuries. Among countries in the world that have received the most immigrants in modern history, Argentina, with 6.6 million, ranks second to the United States (27 million), and ahead of other immigr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1933 Births
Events January * January 11 – Sir Charles Kingsford Smith makes the first commercial flight between Australia and New Zealand. * January 17 – The United States Congress votes in favour of Philippines independence, against the wishes of U.S. President Herbert Hoover. * January 28 – "Pakistan Declaration": Choudhry Rahmat Ali publishes (in Cambridge, UK) a pamphlet entitled ''Now or Never; Are We to Live or Perish Forever?'', in which he calls for the creation of a Muslim state in northwest India that he calls " Pakstan"; this influences the Pakistan Movement. * January 30 ** National Socialist German Workers Party leader Adolf Hitler is appointed Chancellor of Germany by President of Germany Paul von Hindenburg. ** Édouard Daladier forms a government in France in succession to Joseph Paul-Boncour. He is succeeded on October 26 by Albert Sarraut and on November 26 by Camille Chautemps. February * February 1 – Adolf Hitler gives his "Proclamation to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
