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Tunguska Event
The Tunguska event was a large explosion of between 3 and 50 TNT equivalent, megatons that occurred near the Podkamennaya Tunguska River in Yeniseysk Governorate (now Krasnoyarsk Krai), Russia, on the morning of 30 June 1908. The explosion over the sparsely populated East Siberian taiga felled an estimated 80 million trees over an area of of forest, and eyewitness accounts suggest up to three people may have died. The explosion is attributed to a meteor air burst, the atmospheric explosion of a stony asteroid about wide. The asteroid approached from the east-south-east, probably with a relatively high speed of about . Though the incident is classified as an impact event, the object is thought to have exploded at an altitude of rather than hitting the Earth's surface, leaving no impact crater. The Tunguska event is the largest impact event on Earth in recorded history, though List of impact craters on Earth, much larger impacts are believed to have occurred in prehistoric ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Podkamennaya Tunguska River
The Podkamennaya Tunguska (, literally ''Tunguska under the stones''; , Ket language, Ket: Ӄо’ль) also known as ''Middle Tunguska'' or ''Stony Tunguska'', is a river in Krasnoyarsk Krai, Russia. History In 1908, an asteroid impacted near the river and later became known as the Tunguska event. Hydrology The river's nutrition is mainly snow (60%); rain and groundwater nutrition account for 16 and 24%, respectively. The flood lasts from the beginning of May to the end of June, in the lower reaches until the beginning of July. From July to October, there is a summer low, interrupted by a rise in the level to 5.5 m during floods, which can be from one to four per year. The average annual water consumption at the mouth is 1587.18 m3/s, during summer floods it reaches 35,000 m3/s. Ice phenomena have been occurring since mid-October, the autumn ice drift of 7-16 days is accompanied by the formation of Ice jam, ice jams. The ice age is from the end of October to the middle of May. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tunguska Event In Fiction
The Tunguska event—an enormous explosion in a remote region of Siberia on 30 June 1908—has appeared in many works of fiction. History The event had a long-lasting influence on disaster stories featuring comets. Cause While the event is generally held to have been caused by a meteor air burst, several alternative explanations have been proposed both in scientific circles and in fiction. A popular one in fiction is that it was caused by an alien spaceship, possibly first put forth in Ed Earl Repp's 1930 short story " The Second Missile". It gained prominence following the publication of Russian science fiction writer Alexander Kazantsev's 1946 short story "Explosion"; inspired by the similarities between the event and the nuclear bombing of Hiroshima, Kazantsev's story posits that a nuclear explosion in the engine of a spacecraft was responsible. An alien spacecraft is also the explanation in Polish science fiction writer Stanisław Lem's 1951 novel ''The Astronauts'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Space Shuttle
The Space Shuttle is a retired, partially reusable launch system, reusable low Earth orbital spacecraft system operated from 1981 to 2011 by the U.S. National Aeronautics and Space Administration (NASA) as part of the Space Shuttle program. Its official program name was the Space Transportation System (STS), taken from the 1969 plan led by U.S. vice president Spiro Agnew for a system of reusable spacecraft where it was the only item funded for development. The first (STS-1) of four orbital test flights occurred in 1981, leading to operational flights (STS-5) beginning in 1982. Five complete Space Shuttle orbiter vehicles were built and flown on a total of 135 missions from 1981 to 2011. They launched from the Kennedy Space Center (KSC) in Florida. Operational missions launched numerous satellites, interplanetary probes, and the Hubble Space Telescope (HST), conducted science experiments in orbit, participated in the Shuttle–Mir program, Shuttle-''Mir'' program with Russia, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Journal Of The British Astronomical Association
The ''Journal of the British Astronomical Association'' is a peer review, peer-reviewed scientific journal of astronomy published by the British Astronomical Association since October 1890. It is currently Editor-in-chief, edited by Philip Jennings and publishes original research articles, as well as news items relevant to the association and the proceedings of association meetings. Letters to the editor, book reviews, and obituaries are also published. Abstracting and indexing The journal is indexed and abstracted in the following databases: Editors *Edward Walter Maunder 1890-1894 *Annie scott dill russell, Annie Scott Dill Russell 1894-1896 *Edward Walter Maunder 1896-1900 *Frederick William Levander 1900-1916 *Annie Russell Maunder, Annie Scott Dill Maunder 1917-1930 *Peter Doig 1930-1937 *R. M. Fry 1937-1946 *Francis John Sellers 1941-1946 (acting) *John Leslie Haughton 1946-1948 *Peter Doig 1948-1952 *Neville Goodman 1952-1960 *D. G. Hinds 1960-1963 *Frank Hyde 1963-1965 *Co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Richter Scale
The Richter scale (), also called the Richter magnitude scale, Richter's magnitude scale, and the Gutenberg–Richter scale, is a measure of the strength of earthquakes, developed by Charles Richter in collaboration with Beno Gutenberg, and presented in Richter's landmark 1935 paper, where he called it the "magnitude scale". This was later revised and renamed the local magnitude scale, denoted as ML or .. Because of various shortcomings of the original scale, most seismological authorities now use other similar scales such as the moment magnitude scale () to report earthquake magnitudes, but much of the news media still erroneously refers to these as "Richter" magnitudes. All magnitude scales retain the logarithmic character of the original and are scaled to have roughly comparable numeric values (typically in the middle of the scale). Due to the variance in earthquakes, it is essential to understand the Richter scale uses common logarithms simply to make the measurements mana ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Batavia, Dutch East Indies
Batavia was the capital of the Dutch East Indies. The area corresponds to present-day Jakarta, Indonesia. Batavia can refer to the city proper or its suburbs and hinterland, the , which included the much larger area of the Residency of Batavia in the present-day Indonesian provinces of Jakarta, Banten and West Java. The founding of Batavia by the Dutch in 1619, on the site of the ruins of History of Jakarta, Jayakarta, led to the establishment of a Dutch colony; Batavia became the center of the Dutch East India Company's trading network in Asia. Monopolies on local produce were augmented by non-indigenous cash crops. To safeguard their commercial interests, the company and the colonial administration absorbed surrounding territory. Batavia is on the north coast of Java, in a sheltered bay, on a land of marshland and hills crisscrossed with canals. The city had two centers: Kota Tua Jakarta, Oud Batavia (the oldest part of the city) and Sawah Besar, Weltevreden (the relatively n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seismology
Seismology (; from Ancient Greek σεισμός (''seismós'') meaning "earthquake" and -λογία (''-logía'') meaning "study of") is the scientific study of earthquakes (or generally, quakes) and the generation and propagation of elastic waves through planetary bodies. It also includes studies of the environmental effects of earthquakes such as tsunamis; other seismic sources such as volcanoes, plate tectonics, glaciers, rivers, oceanic microseisms, and the atmosphere; and artificial processes such as explosions. Paleoseismology is a related field that uses geology to infer information regarding past earthquakes. A recording of Earth's motion as a function of time, created by a seismograph is called a seismogram. A seismologist is a scientist who works in basic or applied seismology. History Scholarly interest in earthquakes can be traced back to antiquity. Early speculations on the natural causes of earthquakes were included in the writings of Thales of Miletu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shock Wave
In physics, a shock wave (also spelled shockwave), or shock, is a type of propagating disturbance that moves faster than the local speed of sound in the medium. Like an ordinary wave, a shock wave carries energy and can propagate through a medium, but is characterized by an abrupt, nearly discontinuous, change in pressure, temperature, and density of the medium. For the purpose of comparison, in supersonic speed, supersonic flows, additional increased expansion may be achieved through an expansion fan, also known as a Prandtl–Meyer expansion fan. The accompanying expansion wave may approach and eventually collide and recombine with the shock wave, creating a process of destructive interference. The sonic boom associated with the passage of a supersonic aircraft is a type of sound wave produced by Wave interference, constructive interference. Unlike solitons (another kind of nonlinear wave), the energy and speed of a shock wave alone dissipates relatively quickly with distan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Baikal
Lake Baikal is a rift lake and the deepest lake in the world. It is situated in southern Siberia, Russia between the Federal subjects of Russia, federal subjects of Irkutsk Oblast, Irkutsk Oblasts of Russia, Oblast to the northwest and the Republic of Buryatia to the southeast. At —slightly larger than Belgium—Lake Baikal is the world's List of lakes by area, seventh-largest lake by surface area, as well as the second largest lake in Eurasia after the Caspian Sea. However, because it is also the List of lakes by depth, deepest lake, with a maximum depth of , Lake Baikal is the world's List of lakes by volume, largest freshwater lake by volume, containing of water or 22–23% of the world's fresh surface water, more than all of the North American Great Lakes combined. It is also the world's ancient lake, oldest lake at 25–30 million years, and among the clearest. It is estimated that the lake contains around 19% of the unfrozen fresh water on the planet. Lake Baikal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Evenkis
The Evenki, also known as the Evenks and formerly as the Tungus, are a Tungusic people of North Asia. In Russia, the Evenki are recognised as one of the indigenous peoples of the Russian North, with a population of 38,396 ( 2010 census). In China, the Evenki form one of the 56 ethnic groups officially recognised by the People's Republic of China, with a population of 30,875 ( 2010 census). There are 537 Evenki in Mongolia (2015 census), called ''Khamnigan'' in the Mongolian language. Origin The Evenki or Ewenki are sometimes conjectured to be connected to the Shiwei people who inhabited the Greater Khingan Range in the 5th to 9th centuries, although the native land of the majority of Evenki people is in the vast regions of Siberia between Lake Baikal and the Amur River. The Evenki language forms the northern branch of the Manchu-Tungusic language group and is closely related to Even and Negidal in Siberia. By 1600 the Evenki or Ewenki of the Lena and Yenisey river valley ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soviet Calendar
The Soviet calendar was a modified Gregorian calendar that was used in Soviet Russia between 1918 and 1940. Several variations were used during that time. The Gregorian calendar, under the name "Western European calendar", was implemented in Soviet Russia in February 1918 by dropping the Julian dates of . As many as nine national holidays (paid days of rest) were implemented in the following decade, but four were eliminated or merged on , leaving only five national holidays: 22January, 1–2May, and 7–8November until 1951, when 22January reverted to a normal day. During the summer of 1929, five-day continuous work weeks were implemented in factories, government offices, and commercial enterprises, but not collective farms. One of the five days was randomly assigned to each worker as their day of rest, without regard to the rest days assigned to their family members or friends. These five-day work weeks continued throughout the Gregorian year, interrupted only by the five natio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Julian Calendar
The Julian calendar is a solar calendar of 365 days in every year with an additional leap day every fourth year (without exception). The Julian calendar is still used as a religious calendar in parts of the Eastern Orthodox Church and in parts of Oriental Orthodox Churches, Oriental Orthodoxy as well as by the Amazigh, Amazigh people (also known as the Berbers). The Julian calendar was proposed in 46 BC by (and takes its name from) Julius Caesar, as a reform of the earlier Roman calendar, which was largely a lunisolar calendar, lunisolar one. It took effect on , by his edict. Caesar's calendar became the predominant calendar in the Roman Empire and subsequently most of the Western world for more than 1,600 years, until 1582 when Pope Gregory XIII promulgated a revised calendar. Ancient Romans typically designated years by the names of ruling consuls; the ''Anno Domini'' system of numbering years was not devised until 525, and became widespread in Europe in the eighth cent ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
