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Gavriil Tikhov
Gavriil Adrianovich Tikhov (, 1 May 1875 – 25 January 1960) was a Soviet astronomer who was a pioneer in astrobiology and is considered to be the father of astrobotany. He worked as an observer at the Pulkovo Observatory from 1906 until 1941. After undertaking an expedition to Alma-Ata to observe the solar eclipse of September 21, 1941, he remained and became one of the founders of the Kamenskoe Plateau Observatory, the Fesenkov Astrophysical Institute, and the Kazakhstan Academy of Sciences. G. A. Tikhov was born in Smolevichy, near Minsk, in the family of a railway employee, the family often moved from place to place. He began to study at the gymnasium of Pavlodar, and completed secondary education at the Simferopol gymnasium. Living in Simferopol, he once saw two bright stars in the clear evening sky. He learned from the teacher of the Simferopol gymnasium that these stars are the planet Venus and the star Sirius. At the Simferopol Public Library, he read two astronomical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pulkovo Observatory
The Pulkovo Astronomical Observatory (), officially named the Central Astronomical Observatory of the Russian Academy of Sciences at Pulkovo, is the principal astronomical observatory of the Russian Academy of Sciences. It is located 19 km south of Saint Petersburg on Pulkovo Heights above sea level. It is part of the UNESCO World Heritage Site Historic Centre of Saint Petersburg and Related Groups of Monuments. It was formerly known as the Imperial Observatory at Pulkowo. Early years The observatory was opened in 1839. Originally, it was a brainchild of the German/Russian astronomer Friedrich Georg Wilhelm von Struve, who would become its first director (in 1861, his son Otto Wilhelm von Struve succeeded him). The architect was Alexander Bryullov. The observatory was equipped with state-of-the-art devices, one of them being the a aperture refractor, one of the largest refractors in the world at that time (see Great Refractor). In 1885, the observatory was equipped wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Simferopol
Simferopol ( ), also known as Aqmescit, is the second-largest city on the Crimea, Crimean Peninsula. The city, along with the rest of Crimea, is internationally recognised as part of Ukraine, but controlled by Russia. It is considered the capital of the Autonomous Republic of Crimea. Since 2014 it has been under the ''de facto'' control of Russia, which Annexation of Crimea by the Russian Federation, annexed Crimea that year and regards Simferopol as the capital of the Republic of Crimea (Russia), Republic of Crimea. Simferopol is an important political, economic and transport hub of the peninsula, and serves as the administrative centre of both Simferopol Municipality and the surrounding Simferopol District. Its population was After the 1784 Annexation of Crimea by the Russian Empire, annexation of the Crimean Khanate by the Russian Empire, the Russian empress decreed the foundation of a city named Simferopol on the location of the Crimean Tatars, Crimean Tatar town of Old ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Discovery
Discovery may refer to: * Discovery (observation), observing or finding something unknown * Discovery (fiction), a character's learning something unknown * Discovery (law), a process in courts of law relating to evidence Discovery, The Discovery or Discoveries may also refer to: Film and television * ''The Discovery'' (film), a 2017 British-American romantic science fiction film * Discovery Channel, an American TV channel owned by Warner Bros. Discovery * ''Discovery'' (Canadian TV series), a 1962–1963 Canadian documentary television program * ''Discovery'' (Irish TV series), an Irish documentary television programme * ''Discovery'' (UK TV programme), a British documentary television programme * ''Discovery'' (U.S. TV series), a 1962–1971 American television news program * '' Star Trek: Discovery'', an American television series ** USS ''Discovery'' (NCC-1031), a fictional space craft on ''Star Trek: Discovery'' *"The Discovery," the eighth and final episode of ''Pok ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2251 Tikhov
51 may refer to: * 51 (number) * The year ** 51 BC ** AD 51 ** 1951 ** 2051 In contemporary history, the third millennium is the current millennium in the ''Anno Domini'' or Common Era, under the Gregorian calendar. It began on 1 January 2001 ( MMI) and will end on 31 December 3000 ( MMM), spanning the 21st to 30th ... * ''51'' (film), a 2011 American horror film directed by Jason Connery * " Fifty-One", an episode of the American television drama series ''Breaking Bad'' * ''51'' (album), a 2012 mixtape by rapper Kool A.D. * "Fifty One", a song by Karma to Burn from the album '' V'', 2011 * 51 Nemausa, a main-belt asteroid {{Numberdis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tikhov (Martian Crater)
Gavriil Adrianovich Tikhov (, 1 May 1875 – 25 January 1960) was a Soviet astronomer who was a pioneer in astrobiology and is considered to be the father of astrobotany. He worked as an observer at the Pulkovo Observatory from 1906 until 1941. After undertaking an expedition to Alma-Ata to observe the solar eclipse of September 21, 1941, he remained and became one of the founders of the Kamenskoe Plateau Observatory, the Fesenkov Astrophysical Institute, and the Kazakhstan Academy of Sciences. G. A. Tikhov was born in Smolevichy, near Minsk, in the family of a railway employee, the family often moved from place to place. He began to study at the gymnasium of Pavlodar, and completed secondary education at the Simferopol gymnasium. Living in Simferopol, he once saw two bright stars in the clear evening sky. He learned from the teacher of the Simferopol gymnasium that these stars are the planet Venus and the star Sirius. At the Simferopol Public Library, he read two astronomi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Moon
The Moon is Earth's only natural satellite. It Orbit of the Moon, orbits around Earth at Lunar distance, an average distance of (; about 30 times Earth diameter, Earth's diameter). The Moon rotation, rotates, with a rotation period (lunar day) that is synchronized to its orbital period (Lunar month#Synodic month, lunar month) of 29.5 Earth days. This is the product of Earth's gravitation having tidal forces, tidally pulled on the Moon until one part of it stopped rotating away from the near side of the Moon, near side, making always the same lunar surface face Earth. Conversley, the gravitational pull of the Moon, on Earth, is the main driver of Earth's tides. In geophysical definition of planet, geophysical terms, the Moon is a planetary-mass object or satellite planet. Its mass is 1.2% that of the Earth, and its diameter is , roughly one-quarter of Earth's (about as wide as the contiguous United States). Within the Solar System, it is the List of Solar System objects by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tikhov (lunar Crater)
Tikhov is an eroded Lunar craters, lunar impact crater on the Moon's Far side (Moon), far side. It is nearly attached to the east-southeastern outer rim of the larger crater Avogadro (crater), Avogadro. About one crater diameter the east-northeast of Tikhov is the equally worn crater Emden (crater), Emden, and to south-southeast lies the younger Tsinger (crater), Tsinger. This feature has been battered by subsequent impacts, leaving a series of smaller craters along the rim, inner wall, and floor of the crater. The most recent of these impacts are several small, cup-shaped craters along the eastern rim and inner wall and floor. As a result of this wear, the outer rim is rounded and uneven, although the circular nature of the rim can still be discerned. See also * Asteroid 2251 Tikhov References * * * * * * * * * * * * {{refend Impact craters on the Moon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solar System
The Solar SystemCapitalization of the name varies. The International Astronomical Union, the authoritative body regarding astronomical nomenclature, specifies capitalizing the names of all individual astronomical objects but uses mixed "Solar System" and "solar system" structures in theinaming guidelines document. The name is commonly rendered in lower case ('solar system'), as, for example, in the ''Oxford English Dictionary'' an''Merriam-Webster's 11th Collegiate Dictionary''. is the gravitationally bound Planetary system, system of the Sun and the objects that orbit it. It Formation and evolution of the Solar System, formed about 4.6 billion years ago when a dense region of a molecular cloud collapsed, forming the Sun and a protoplanetary disc. The Sun is a typical star that maintains a hydrostatic equilibrium, balanced equilibrium by the thermonuclear fusion, fusion of hydrogen into helium at its stellar core, core, releasing this energy from its outer photosphere. As ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Planet
A planet is a large, Hydrostatic equilibrium, rounded Astronomical object, astronomical body that is generally required to be in orbit around a star, stellar remnant, or brown dwarf, and is not one itself. The Solar System has eight planets by the most restrictive definition of the term: the terrestrial planets Mercury (planet), Mercury, Venus, Earth, and Mars, and the giant planets Jupiter, Saturn, Uranus, and Neptune. 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 (astrophysics), accretion. The word ''planet'' comes from the Greek () . In Classical antiquity, antiquity, this word referred to the Sun, Moon, and five points of light visible to the naked eye that moved across the background of the stars—namely, Me ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Star
A star is a luminous spheroid of plasma (physics), plasma held together by Self-gravitation, self-gravity. The List of nearest stars and brown dwarfs, nearest star to Earth is the Sun. Many other stars are visible to the naked eye at night sky, night; their immense distances from Earth make them appear as fixed stars, fixed points of light. The most prominent stars have been categorised into constellations and asterism (astronomy), asterisms, and many of the brightest stars have proper names. Astronomers have assembled star catalogues that identify the known stars and provide standardized stellar designations. The observable universe contains an estimated to stars. Only about 4,000 of these stars are visible to the naked eye—all within the Milky Way galaxy. A star's life star formation, begins with the gravitational collapse of a gaseous nebula of material largely comprising hydrogen, helium, and traces of heavier elements. Its stellar mass, total mass mainly determines it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stellar Classification
In astronomy, stellar classification is the classification of stars based on their stellar spectrum, spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a Prism (optics), prism or diffraction grating into a spectrum exhibiting the Continuum (spectrum), rainbow of colors interspersed with spectral lines. Each line indicates a particular chemical element or molecule, with the line strength indicating the abundance of that element. The strengths of the different spectral lines vary mainly due to the temperature of the photosphere, although in some cases there are true abundance differences. The ''spectral class'' of a star is a short code primarily summarizing the ionization state, giving an objective measure of the photosphere's temperature. Most stars are currently classified under the Morgan–Keenan (MK) system using the letters ''O'', ''B'', ''A'', ''F'', ''G'', ''K'', and ''M'', a sequence from the hottest (''O'' type) to the cool ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chromatic Aberration
In optics, chromatic aberration (CA), also called chromatic distortion, color aberration, color fringing, or purple fringing, is a failure of a lens to focus all colors to the same point. It is caused by dispersion: the refractive index of the lens elements varies with the wavelength of light. The refractive index of most transparent materials decreases with increasing wavelength. Since the focal length of a lens depends on the refractive index, this variation in refractive index affects focusing. Since the focal length of the lens varies with the color of the light different colors of light are brought to focus at different distances from the lens or with different levels of magnification. Chromatic aberration manifests itself as "fringes" of color along boundaries that separate dark and bright parts of the image. Types There are two types of chromatic aberration: ''axial'' (''longitudinal''), and ''transverse'' (''lateral''). Axial aberration occurs when different wavelengt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
