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Wojciech Krzemiński
Wojciech Krzemiński (20 May 1933 – 5 August 2017) was a Polish astronomer and a retired professor of Nicolaus Copernicus Astronomical Center of Polish Academy of Sciences. He worked many years for the Carnegie Institution for Science Observatories. Biography Wojciech Krzemiński was a student of professors Stefan Piotrowski and Włodzimierz Zonn. In the early 1960s he was active in Lick Observatory and Lowell Observatory in USA, and at the end of the 1960s he received a scholarship at Carnegie Institution. In 1973, he left – as the first Polish astronomer – to Las Campanas Observatory in Chile. In the 1970s Krzemiński actively collaborated with professors Bohdan Paczyński and Józef Smak. In the 1980s he received an offer to take over as administrator or "resident astronomer" of Las Campanas, position which he held for 16 years. He lived many years in La Serena in Chile and returned to Poland in 2011. Scientific achievements Wojciech Krzemiński was one of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Warsaw
Warsaw ( pl, Warszawa, ), officially the Capital City of Warsaw,, abbreviation: ''m.st. Warszawa'' is the capital and largest city of Poland. The metropolis stands on the River Vistula in east-central Poland, and its population is officially estimated at 1.86 million residents within a greater metropolitan area of 3.1 million residents, which makes Warsaw the 7th most-populous city in the European Union. The city area measures and comprises 18 districts, while the metropolitan area covers . Warsaw is an Alpha global city, a major cultural, political and economic hub, and the country's seat of government. Warsaw traces its origins to a small fishing town in Masovia. The city rose to prominence in the late 16th century, when Sigismund III decided to move the Polish capital and his royal court from Kraków. Warsaw served as the de facto capital of the Polish–Lithuanian Commonwealth until 1795, and subsequently as the seat of Napoleon's Duchy of Warsaw. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
La Serena, Chile
La Serena () is a city and commune in northern Chile, capital of the Coquimbo Region. Founded in 1544, it is the country's second oldest city after the national capital, Santiago. As of 2012, it had a communal population of roughly 200,000, and was one of the fastest-growing areas of Chile. The city is an important tourist destination, especially during the summer, where people go to visit the beaches. It is in the headquarters of the University of La Serena and also is home to the Roman Catholic Archdiocese of La Serena, one of five Catholic Archdioceses of the Catholic Church in Chile. History The sector is currently located where the city was inhabited by the pre-Hispanic village called Viluma or Vilumanque (Mapudungún Snakes and condors). La Serena was founded on the orders of the Spaniard Pedro de Valdivia in order to provide a sea link to maintain permanent contact between Santiago and Lima in the Viceroyalty of Peru. For this he would need a place for his troops to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Robert Kraft (astronomer)
Robert Paul "Bob" Kraft (June 16, 1927 – May 26, 2015) was an American astronomer. He performed pioneering work on Cepheid variables, stellar rotation, novae, and the chemical evolution of the Milky Way. His name is also associated with the Kraft break: the abrupt change in the average rotation rate of main sequence stars around spectral type F8. Career Kraft served as director of the Lick Observatory (1981–1991), president of the American Astronomical Society (1974–1976), and president of the International Astronomical Union (1997–2000). He received his B.S. at the University of Washington in 1947, M.S. in mathematics at the University of Washington in 1949, and PhD from the University of California, Berkeley. He died in 2015. Honors Awards *Helen B. Warner Prize for Astronomy (1962) *Henry Norris Russell Lectureship (1995) *Bruce Medal (2005) *National Academy of Sciences Named after him *Asteroid An asteroid is a minor planet of the inner Solar Syste ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Main Sequence
In astronomy, the main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell. Stars on this band are known as main-sequence stars or dwarf stars. These are the most numerous true stars in the universe and include the Sun. After condensation and ignition of a star, it generates thermal energy in its dense core region through nuclear fusion of hydrogen into helium. During this stage of the star's lifetime, it is located on the main sequence at a position determined primarily by its mass but also based on its chemical composition and age. The cores of main-sequence stars are in hydrostatic equilibrium, where outward thermal pressure from the hot core is balanced by the inward pressure of gravitational collapse from the overlying layers. The strong dependence of the rate of energy ge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Roche Surface
F. Hoffmann-La Roche AG, commonly known as Roche, is a Swiss multinational healthcare company that operates worldwide under two divisions: Pharmaceuticals and Diagnostics. Its holding company, Roche Holding AG, has shares listed on the SIX Swiss Exchange. The company headquarters are located in Basel. Roche is the fifth largest pharmaceutical company in the world by revenue, and the leading provider of cancer treatments globally. The company controls the American biotechnology company Genentech, which is a wholly owned affiliate, and the Japanese biotechnology company Chugai Pharmaceuticals, as well as the United States-based companies Ventana and Foundation Medicine. Roche's revenues during fiscal year 2020 were 58.32 billion Swiss francs. Descendants of the founding Hoffmann and Oeri families own slightly over half of the bearer shares with voting rights (a pool of family shareholders 45%, and Maja Oeri a further 5% apart), with Swiss pharma firm Novartis owning a further ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
