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Microscopium Void
The Microscopium Void is a void—a roughly rectangular region of relatively empty space, bounded by incomplete sheets of galaxies from other voids in the southern celestial hemisphere. It lies within the boundaries of the constellation of Microscopium. It was discovered and named by South African astronomer Tony Fairall in 1984. See also *List of voids This is a list of voids in astronomy. Voids are particularly galaxy-poor regions of space between filaments, making up the large-scale structure of the universe. Some voids are known as ''supervoids''. In the tables, ''z'' is the cosmological ... References {{reflist Microscopium Voids (astronomy) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Void (astronomy)
Cosmic voids (also known as dark space) are vast spaces between filaments (the largest-scale structures in the universe), which contain very few or no galaxies. The cosmological evolution of the void regions differs drastically from the evolution of the Universe as a whole: there is a long stage when the curvature term dominates, which prevents the formation of galaxy clusters and massive galaxies. Hence, although even the emptiest regions of voids contain more than ~15% of the average matter density of the Universe, the voids look almost empty for an observer. Voids typically have a diameter of 10 to 100 megaparsecs (30 to 300 million light-years); particularly large voids, defined by the absence of rich superclusters, are sometimes called supervoids. They were first discovered in 1978 in a pioneering study by Stephen Gregory and Laird A. Thompson at the Kitt Peak National Observatory. Voids are believed to have been formed by baryon acoustic oscillations in the Big Bang, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microscopium
Microscopium ("the Microscope") is a minor constellation in the southern celestial hemisphere, one of twelve created in the 18th century by French astronomer Nicolas-Louis de Lacaille and one of several depicting scientific instruments. The name is a Latinised form of the Greek word for microscope. Its stars are faint and hardly visible from most of the non-tropical Northern Hemisphere. The constellation's brightest star is Gamma Microscopii of apparent magnitude 4.68, a yellow giant 2.5 times the Sun's mass located 223 ± 8 light-years distant. It passed within 1.14 and 3.45 light-years of the Sun some 3.9 million years ago, possibly disturbing the outer Solar System. Two star systems— WASP-7 and HD 205739—have been determined to have planets, while two others—the young red dwarf star AU Microscopii and the sunlike HD 202628—have debris disks. AU Microscopii and the binary red dwarf system AT Microscopii are probably a wide triple system and members of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anthony Patrick Fairall
Anthony Patrick (Tony) Fairall (September 15, 1943 – November 22, 2008) was a South African astronomer most noted for his work on exploring the large-scale structure of the Universe, such as filaments and voids. He was the director of what is now the Iziko planetarium in Cape Town and was a well-known popularizer of astronomy in South Africa. Fairall was born in London and moved with his family to Johannesburg, South Africa, in 1948 and then Harare, Zimbabwe in 1953. He studied at the University of Cape Town, completing his undergraduate degree in 1966. He studied for his doctorate under Gerard de Vaucouleurs and Fritz Zwicky at the University of Texas at Austin The University of Texas at Austin (UT Austin, UT, or Texas) is a public research university in Austin, Texas. It was founded in 1883 and is the oldest institution in the University of Texas System. With 40,916 undergraduate students, 11,075 ..., receiving his degree in 1970. Fairall discovered and named Faira ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Voids
This is a list of voids in astronomy. Voids are particularly galaxy-poor regions of space between filaments, making up the large-scale structure of the universe. Some voids are known as ''supervoids''. In the tables, ''z'' is the cosmological redshift, ''c'' the speed of light, and ''h'' the dimensionless Hubble parameter, which has a value of approximately 0.7 (the Hubble constant ''H''0 = ''h'' × 100 km s−1 Mpc−1). Mpc stands for megaparsec. The co-ordinates (right ascension and declination) and distance given refer to the approximate center of the region. Voids and supervoids Largest voids Named voids SIMBAD"list of objects in '*void' wildcard search"(accessed 15 September 2009)SIMBAD"list of objects of type 'vid'"(accessed 15 September 2009) Voids designated by their constellation Other voids Voids by search or survey Tully list In 1985, Tully determined a local dominant supercluster plane, and found the Pisces–Cetus Superclust ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
