|
Sebastian Von Hoerner
Sebastian Rudolf Karl von Hoerner (15 April 1919 – 7 January 2003) was a German astrophysicist and radio astronomer. He was born in Görlitz, Lower Silesia. After the end of World War II he studied physics at University of Göttingen. He obtained his doctorate at the same university in 1951 as Carl Friedrich von Weizsäcker. Together they conducted simulations that studied the formation of stars and globular clusters. He continued this work at Astronomical Calculation Institute (University of Heidelberg) with Walter Fricke. He obtained his habilitation in 1959 at the University of Heidelberg. In 1962 he moved to National Radio Astronomy Observatory (Green Bank, West Virginia), where he collaborated, inter alia, with Frank Drake. He worked there, among others on the analysis of work and technical optimization of radio telescopes. His research led to the development of a new method for the construction of radio telescopes, later used in the construction of many of them. During thi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Milky Way
The Milky Way is the galaxy that includes our Solar System, with the name describing the galaxy's appearance from Earth: a hazy band of light seen in the night sky formed from stars that cannot be individually distinguished by the naked eye. The term ''Milky Way'' is a translation of the Latin ', from the Greek ('), meaning "milky circle". From Earth, the Milky Way appears as a band because its disk-shaped structure is viewed from within. Galileo Galilei first resolved the band of light into individual stars with his telescope in 1610. Until the early 1920s, most astronomers thought that the Milky Way contained all the stars in the Universe. Following the 1920 Great Debate between the astronomers Harlow Shapley and Heber Curtis, observations by Edwin Hubble showed that the Milky Way is just one of many galaxies. The Milky Way is a barred spiral galaxy with an estimated D25 isophotal diameter of , but only about 1,000 light years thick at the spiral arms (more at the bulg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1919 Births
Events January * January 1 ** The Czechoslovak Legions occupy much of the self-proclaimed "free city" of Pressburg (now Bratislava), enforcing its incorporation into the new republic of Czechoslovakia. ** HMY ''Iolaire'' sinks off the coast of the Hebrides; 201 people, mostly servicemen returning home to Lewis and Harris, are killed. * January 2– 22 – Russian Civil War: The Red Army's Caspian-Caucasian Front begins the Northern Caucasus Operation against the White Army, but fails to make progress. * January 3 – The Faisal–Weizmann Agreement is signed by Emir Faisal (representing the Arab Kingdom of Hejaz) and Zionist leader Chaim Weizmann, for Arab–Jewish cooperation in the development of a Jewish homeland in Palestine, and an Arab nation in a large part of the Middle East. * January 5 – In Germany: ** Spartacist uprising in Berlin: The Marxist Spartacus League, with the newly formed Communist Party of Germany and the Independent Social De ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hanna Von Hoerner
Hanna von Hoerner (14 November 1942 – 4 July 2014) was a German astrophysicist. She founded the company von Hoerner & Sulger which produces scientific instruments, notably cosmic dust analyzers used on space missions by European Space Agency (ESA) and NASA. Early life Hanna von Hoerner was born in Görlitz in 1942. Her father was the astrophysicist Sebastian von Hoerner. With his help and encouragement she repaired radios when she was six and built an oscilloscope at the age of fourteen. In the early 1960s, after finishing her '' Abitur'', (high school or secondary school,) her father moved to the National Radio Astronomy Observatory (NRAO) in the US. Von Hoerner completed an electronics education in the United States and worked as a research assistant at the National Radio Astronomy Observatory. Education In 1965, von Hoerner returned to Germany to study experimental physics at Heidelberg University. In 1971 she earned an undergraduate degree and in 1974 her PhD, b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baden-Württemberg
Baden-Württemberg (; ), commonly shortened to BW or BaWü, is a German state () in Southwest Germany, east of the Rhine, which forms the southern part of Germany's western border with France. With more than 11.07 million inhabitants across a total area of nearly , it is the third-largest German state by both area (behind Bavaria and Lower Saxony) and population (behind North Rhine-Westphalia and Bavaria). As a federated state, Baden-Württemberg is a partly-sovereign parliamentary republic. The largest city in Baden-Württemberg is the state capital of Stuttgart, followed by Mannheim and Karlsruhe. Other major cities are Freiburg im Breisgau, Heidelberg, Heilbronn, Pforzheim, Reutlingen, Tübingen, and Ulm. What is now Baden-Württemberg was formerly the historical territories of Baden, Prussian Hohenzollern, and Württemberg. Baden-Württemberg became a state of West Germany in April 1952 by the merger of Württemberg-Baden, South Baden, and Württemberg-Hohenzollern. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Esslingen Am Neckar
Esslingen am Neckar ( Swabian: ''Esslenga am Neckor'') is a town in the Stuttgart Region of Baden-Württemberg in southern Germany, seat of the District of Esslingen as well as the largest town in the district. Within Baden-Württemberg it is the 11th largest city. It is located on the river Neckar, about southeast of Stuttgart city center. The regions surrounding the city of Esslingen are also mostly developed. Esslingen was a free imperial city for several centuries until it was annexed by Württemberg in 1802. The German Timber-Frame Road passes through the city. History Prehistoric times There is archaeological evidence that what is now the city of Esslingen was settled since the Neolithic period. Traces of human settlement found at the site of the city church date back to around 1000 B.C. Roman times In the 1st century AD the Esslingen region became part of the Roman Empire. During this period a Roman warehouse was located in the area of Oberesslingen. The near ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Summa Technologiae
''Summa Technologiae'' (the title is in Latin, meaning "Summa (Compendium) of Technology" in English) is a 1964 book by Polish author Stanisław Lem. ''Summa'' is one of the first collections of philosophical essays by Lem. The book exhibits depth of insight and irony usual for Lem's creations. The name is an allusion to ''Summa Theologiae'' by Thomas Aquinas.Joanna Zylinska, translator's introduction, in: ''Summa Technologiae'', University of Minnesota Press, Minneapolis-London, 2013, . Description Paraphrasing the author, the book tries to "examine the thorns of roses that have not flowered yet" - in other words, to deal with problems of the remote (and in some cases, not so remote) future. The primary question Lem treats in the book is that of civilization in the absence of limitations, both technological and material. He also looks at moral-ethical and philosophical consequences of future technologies. Despite its age and a number of inaccuracies in specific domains (e.g., ma ... [...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] |
Planet
A planet is a large, rounded astronomical body that is neither a star nor its remnant. The best available theory of planet formation is the nebular hypothesis, which posits that an interstellar cloud collapses out of a nebula to create a young protostar orbited by a protoplanetary disk. Planets grow in this disk by the gradual accumulation of material driven by gravity, a process called accretion. The Solar System has at least eight planets: the terrestrial planets Mercury, Venus, Earth and Mars, and the giant planets Jupiter, Saturn, Uranus and Neptune. These planets each rotate around an axis tilted with respect to its orbital pole. All of them possess an atmosphere, although that of Mercury is tenuous, and some share such features as ice caps, seasons, volcanism, hurricanes, tectonics, and even hydrology. Apart from Venus and Mars, the Solar System planets generate magnetic fields, and all except Venus and Mercury have natural satellites. The giant planets bear plan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earth
Earth is the third planet from the Sun and the only astronomical object known to harbor life. While large volumes of water can be found throughout the Solar System, only Earth sustains liquid surface water. About 71% of Earth's surface is made up of the ocean, dwarfing Earth's polar ice, lakes, and rivers. The remaining 29% of Earth's surface is land, consisting of continents and islands. Earth's surface layer is formed of several slowly moving tectonic plates, which interact to produce mountain ranges, volcanoes, and earthquakes. Earth's liquid outer core generates the magnetic field that shapes the magnetosphere of the Earth, deflecting destructive solar winds. The atmosphere of the Earth consists mostly of nitrogen and oxygen. Greenhouse gases in the atmosphere like carbon dioxide (CO2) trap a part of the energy from the Sun close to the surface. Water vapor is widely present in the atmosphere and forms clouds that cover most of the planet. More solar e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Science (journal)
''Science'', also widely referred to as ''Science Magazine'', is the peer-reviewed academic journal of the American Association for the Advancement of Science (AAAS) and one of the world's top academic journals. It was first published in 1880, is currently circulated weekly and has a subscriber base of around 130,000. Because institutional subscriptions and online access serve a larger audience, its estimated readership is over 400,000 people. ''Science'' is based in Washington, D.C., United States, with a second office in Cambridge, UK. Contents The major focus of the journal is publishing important original scientific research and research reviews, but ''Science'' also publishes science-related news, opinions on science policy and other matters of interest to scientists and others who are concerned with the wide implications of science and technology. Unlike most scientific journals, which focus on a specific field, ''Science'' and its rival ''Nature (journal), Nature'' c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Interstellar Communication
Interstellar communication is the transmission of signals between planetary systems. Sending interstellar messages is potentially much easier than interstellar travel, being possible with technologies and equipment which are currently available. However, the distances from Earth to other potentially inhabited systems introduce prohibitive delays, assuming the limitations of the speed of light. Even an immediate reply to radio communications sent to stars tens of thousands of light-years away would take many human generations to arrive. Radio The SETI project has for the past several decades been conducting a search for signals being transmitted by extraterrestrial life located outside the Solar System, primarily in the radio frequencies of the electromagnetic spectrum. Special attention has been given to the Water Hole, the frequency of one of neutral hydrogen's absorption lines, due to the low background noise at this frequency and its symbolic association with the basis for what ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.svg "Click for more on -> Earth")
