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Edwin Hubble
Edwin Powell Hubble (November 20, 1889 – September 28, 1953) was an American astronomer. He played a crucial role in establishing the fields of extragalactic astronomy and observational cosmology. Hubble proved that many objects previously thought to be clouds of dust and gas and classified as "nebulae" were actually Galaxy, galaxies beyond the Milky Way. He used the strong direct period-luminosity relation, relationship between a classical Cepheid variable's luminosity and periodic function, pulsation period (discovered in 1908 by Henrietta Swan Leavitt) for scaling cosmic distance ladder, galactic and extragalactic distances. Hubble confirmed in 1929 that the recessional velocity of a galaxy increases with its distance from Earth, a behavior that became known as Hubble's law, although it had been proposed two years earlier by Georges Lemaître. The Hubble law implies that the universe is expanding. A decade before, the American astronomer Vesto Slipher had provided the fi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Johan Hagemeyer
Johan Hagemeyer (1 June 1884 21 May 1962) was a Dutch-born horticulturalist and vegetarian who is remembered primarily for being an early 20th century photographer and artistic intellectual. Life and work Hagemeyer was born in Amsterdam, the Netherlands. His family came to California to grow fruit trees, but in 1916 he met photographer Alfred Stieglitz, who convinced him to devote his life to the then emerging world of artistic photography. In 1923 Hagemeyer opened a portrait studio in San Francisco, which he occupied primarily from October thru early April. In 1922 Hagemeyer built a spring-summer studio in Carmel-by-the-Sea, California, at that time the largest art colony on the Pacific coast, and donated his photographs that December to a local fund-raising exhibit. It was here that Hagemeyer met Edward Weston, who encouraged him to further his career in photography. He moved his Carmel address in 1924 to a new "artfully designed studio" at the prominent junction of Mountain Vi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barnard Medal For Meritorious Service To Science
The Barnard Medal for Meritorious Service to Science was established in 1889 by the will of Columbia University president Frederick A. P. Barnard, and has been awarded by Columbia University, based on recommendations by the National Academy of Sciences, every five years since 1895. It is not to be confused with the Barnard Medal of Distinction. Winners * 1895 - John William Strutt, Lord Rayleigh, William Ramsay * 1900 - Wilhelm Röntgen * 1905 - Henri Becquerel * 1910 - Ernest Rutherford * 1915 - William Henry Bragg, William Lawrence Bragg * 1920 - Albert Einstein * 1925 - Niels Bohr * 1930 - Werner Heisenberg * 1935 - Edwin Hubble Edwin Powell Hubble (November 20, 1889 – September 28, 1953) was an American astronomer. He played a crucial role in establishing the fields of extragalactic astronomy and observational cosmology. Hubble proved that many objects previously ... * 1940 - Frédéric Joliot-Curie, Irène Joliot-Curie * 1945 - No award * 1950 - Enri ... [...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] |
Galaxy
A galaxy is a Physical system, system of stars, stellar remnants, interstellar medium, interstellar gas, cosmic dust, dust, and dark matter bound together by gravity. The word is derived from the Ancient Greek, 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 dwarf galaxy, dwarfs with less than a thousand stars, to the List of largest galaxies, largest galaxies known – Type-cD galaxy, supergiants with one hundred 10^12, trillion stars, each orbiting its galaxy's centre of mass. Most of the mass in a typical galaxy is in the form of dark matter, with only a few per cent 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 categorised according to their visual morphology (astronomy), morphology as elliptical galaxy, elliptical, Spiral galaxy, spiral, or irregular galaxy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nebula
A nebula (; or nebulas) is a distinct luminescent part of interstellar medium, which can consist of ionized, neutral, or molecular hydrogen and also cosmic dust. Nebulae are often star-forming regions, such as in the Pillars of Creation in the Eagle Nebula. In these regions, the formations of gas, dust, and other materials "clump" together to form denser regions, which attract further matter and eventually become dense enough to form stars. The remaining material is then thought to form planets and other planetary system objects. Most nebulae are of vast size; some are hundreds of light-years in diameter. A nebula that is visible to the human eye from Earth would appear larger, but no brighter, from close by. The Orion Nebula, the brightest nebula in the sky and occupying an area twice the angular diameter of the full Moon, can be viewed with the naked eye but was missed by early astronomers. Although denser than the space surrounding them, most nebulae are far less dens ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Observational Cosmology
Observational cosmology is the study of the structure, the evolution and the origin of the universe through observation, using instruments such as telescopes and cosmic ray detectors. Early observations The science of physical cosmology as it is practiced today had its subject material defined in the years following the Shapley-Curtis debate when it was determined that the universe had a larger scale than the Milky Way galaxy. This was precipitated by observations that established the size and the dynamics of the cosmos that could be explained by Albert Einstein's General Theory of Relativity. In its infancy, cosmology was a speculative science based on a very limited number of observations and characterized by a dispute between steady state theorists and promoters of Big Bang cosmology. It was not until the 1990s and beyond that the astronomical observations would be able to eliminate competing theories and drive the science to the "Golden Age of Cosmology" which was heralde ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extragalactic Astronomy
Extragalactic astronomy is the branch of astronomy concerned with objects outside the Milky Way galaxy. In other words, it is the study of all astronomical objects which are not covered by galactic astronomy. The closest objects in extragalactic astronomy include the galaxy, galaxies of the Local Group, which are close enough to allow very detailed analyses of their contents (e.g. supernova remnants, Stellar kinematics#Stellar associations, stellar associations). As instrumentation has improved, distant objects can now be examined in more detail and so extragalactic astronomy includes objects at nearly the edge of the observable universe. Research into distant galaxies (outside of our local group) is valuable for studying aspects of the universe such as galaxy evolution and Active galactic nucleus, Active Galactic Nuclei (AGN) which give insight into physical phenomena (e.g. Supermassive black hole, super massive black hole accretion and the presence of dark matter). It is through ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
World War I
World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting took place mainly in European theatre of World War I, Europe and the Middle Eastern theatre of World War I, Middle East, as well as in parts of African theatre of World War I, Africa and the Asian and Pacific theatre of World War I, Asia-Pacific, and in Europe was characterised by trench warfare; the widespread use of Artillery of World War I, artillery, machine guns, and Chemical weapons in World War I, chemical weapons (gas); and the introductions of Tanks in World War I, tanks and Aviation in World War I, aircraft. World War I was one of the List of wars by death toll, deadliest conflicts in history, resulting in an estimated World War I casualties, 10 million military dead and more than 20 million wounded, plus some 10 million civilian de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
86th Infantry Division (United States)
The 86th Infantry Division, also known as the Blackhawk Division, was a unit of the United States Army in World War I and World War II. Currently called the 86th Training Division, based at Fort McCoy, Wisconsin, members of the division now work with Active Army, Reserve, and National Guard units to provide them with a Decisive Action Training Environment on a yearly basis. World War I The 86th Division was first organized on August 25, 1917, about four months after the American entry into World War I, at Camp Grant (Illinois), Camp Grant, Rockford, Illinois. A small Cadre (military), cadre of Regular Army (United States), Regular Army officers and enlisted men, in addition to United States Army Reserve, Officers Reserve Corps and Army of the United States, National Army officer graduates of the First Officers Training Camp held at Fort Sheridan, Illinois, staffed the division and coordinated its organization, while the enlisted men were predominantly Selective Service Act of 191 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Major (United States)
In the United States Army, United States Marine Corps, Marine Corps, United States Air Force, Air Force and United States Space Force, Space Force, major is a field officer above the military rank, rank of Captain (United States O-3), captain and below the rank of Lieutenant colonel (United States), lieutenant colonel. It is equivalent to the rank of Lieutenant commander (United States), lieutenant commander in the United States Navy, Navy and United States Coast Guard, Coast Guard. Although lieutenant commanders are considered junior officers by their services, majors are senior officers. The U.S. uniformed services pay grades, pay grade for the rank of major is O-4. The insignia for the rank consists of a golden Oak#Culture, oak leaf, with slight stylized differences between the versions of the different services. Promotion to the rank of major is governed by the United States Department of Defense, Department of Defense policies derived from the Defense Officer Personnel Manag ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Army
The United States Army (USA) is the primary Land warfare, land service branch of the United States Department of Defense. It is designated as the Army of the United States in the United States Constitution.Article II, section 2, clause 1 of the United States Constitution (1789).See alsTitle 10, Subtitle B, Chapter 301, Section 3001 It operates under the authority, direction, and control of the United States Secretary of Defense, United States secretary of defense. It is one of the six armed forces and one of the eight uniformed services of the United States. The Army is the most senior branch in order of precedence amongst the armed services. It has its roots in the Continental Army, formed on 14 June 1775 to fight against the British for independence during the American Revolutionary War (1775–1783). After the Revolutionary War, the Congress of the Confederation created the United States Army on 3 June 1784 to replace the disbanded Continental Army.Library of CongressJournals ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Legion Of Merit
The Legion of Merit (LOM) is a Awards and decorations of the United States military, military award of the United States Armed Forces that is given for exceptionally meritorious conduct in the performance of outstanding services and achievements. The decoration is issued to members of the eight uniformed services of the United States Note: National Oceanic and Atmospheric Administration Commissioned Officer Corps Amendments Act of 2012 amended the Legion of Merit to be awarded to any uniformed service. as well as to military and political figures of foreign governments. The Legion of Merit (Commander degree) is one of only two United States military decorations to be issued as a neck order (the other being the Medal of Honor), and the only United States military decoration that may be issued in degrees (much like an Order (honour), ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
