[sahy-fert, see-] /ˈsaɪ fərt, ˈsi-/
one of a group of spiral galaxies with compact, bright nuclei having characteristically broad emission lines suggestive of very hot gases in violent motion at the center.
any of a class of spiral galaxies having a very bright nucleus, possibly corresponding to an active period in the lives of all spiral galaxies
A spiral galaxy with a small, compact, bright nucleus that exhibits variable light intensity and radio-wave emission. Seyfert galaxies are active galaxies and are thought to contain a black hole in their galactic nucleus. The nuclei of Seyfert galaxies generate an emission spectrum characteristic of hot, ionized clouds of gas, shooting out from the accretion disk around the black hole. The observations during the 1940s of American astronomer Carl Seyfert (1911-60), after whom the galaxies are named, demonstrated that these jets of gas are expelled from the nucleus at speeds up to millions of miles per hour. See also blazar, quasar.
noun 1. Adana. 2. a river in S central Turkey, flowing S from the Anatolia plateau to the Mediterranean Sea. 748 miles (1204 km) long. noun 1. another name for Adana
noun 1. Jane, c1510–37, third wife of Henry VIII of England and mother of Edward VI. 2. a city in S Indiana. 3. a town in S Connecticut. 4. a male given name. noun 1. Jane. ?1509–37, third wife of Henry VIII of England; mother of Edward VI
- Seymour cray
person The founder of Cray Research and designer of several of their supercomputers. Cray has been a charismatic yet somewhat reclusive figure. He began Cray Research in Minnesota in 1972. In 1988, Cray moved his Cray-3 project to Colorado Springs. The next year, Cray Research spun it off to create Cray Computer. In 1989, Cray […]
1. science fiction. 2. Music. sforzando. 1. science fiction. 2. sinking fund. Insurance. 1. stock and fixtures. 1. science fiction. abbreviation 1. sforzando abbreviation 1. science fiction sf 1. sforzando 2. square feet SF 1. sacrifice fly 2. San Francisco 3. San Francisco 49ers 4. San Francisco Giants 5. scarlet fever 6. science fiction 7. […]