A quasar is an extremely luminous active galactic nucleus (AGN). It has been theorized that most large galaxies contain a supermassive central black hole with mass ranging from millions to billions of times the mass of our Sun. In quasars and other types of AGN, the black hole is surrounded by a gaseous accretion disk. As gas falls toward the black hole, energy is released in the form of electromagnetic radiation, which can be observed across the electromagnetic spectrum. The power radiated by quasars is enormous: the most powerful quasars have luminosities thousands of times greater than a galaxy such as the Milky Way.
A galaxy cluster, or cluster of galaxies, is a structure that consists of anywhere from hundreds to thousands of galaxies that are bound together by gravity with typical masses ranging from 1014–1015 solar masses. They are the largest known gravitationally bound structures in the universe and were believed to be the largest known structures in the universe until the 1980s, when superclusters were discovered. One of the key features of clusters is the intracluster medium (ICM). The ICM consists of heated gas between the galaxies and has a peak temperature between 2–15 keV that is dependent on the total mass of the cluster. Galaxy clusters should not be confused with star clusters, such as open clusters, which are structures of stars within galaxies, or with globular clusters, which typically orbit galaxies. Small aggregates of galaxies are referred to as galaxy groups rather than clusters of galaxies. The galaxy groups and clusters can themselves cluster together to form superclusters.
Cicadidae is the largest family of cicadas, with more than 3,000 species worldwide.
Terence Davies is an English screenwriter, film director, novelist and actor.
Distant Voices, Still Lives is a 1988 British film directed and written by Terence Davies. It evokes working-class family life in Liverpool during the 1940s and early 1950s, paying particular attention to the role of popular music, Hollywood cinema, light entertainment and the public house within this tight-knit community.
The Songs of Distant Earth is the 16th album by Mike Oldfield, released in 1994 by Warner Music. It is based on Arthur C. Clarke's science fiction novel The Songs of Distant Earth.
Solar eclipses on Jupiter occur when any of the natural satellites of Jupiter pass in front of the Sun as seen from the planet Jupiter.
Uzak is a 2002 Turkish film directed by Nuri Bilge Ceylan. It was released as Distant in North America, a literal translation of its title. The movie is the winner of 31 awards including Best Actor at Cannes, Special Jury Prize at Chicago, and Best Balkan Movie at Sofia International Film Festival.
William Lucas Distant was an English entomologist.
The Tibiceninae are a subfamily of cicadas, containing the covered-tymbal cicadas. In some treatments this group is merged whole or in part with the Cicadinae.
Semaphore is one of the earliest forms of fixed railway signals. These signals display their different indications to train drivers by changing the angle of inclination of a pivoted 'arm'. Semaphore signals were patented in the early 1840s by Joseph James Stevens, and soon became the most widely used form of mechanical signal. Designs have altered over the intervening years, and colour light signals have replaced semaphore signals in most countries, but in few they remain in use.
Saint-Germain-Laval is a commune in the Loire department in central France.
Detached objects are a dynamical class of minor planets in the outer reaches of the Solar System and belong to the broader family of trans-Neptunian objects (TNOs). These objects have orbits whose points of closest approach to the Sun (perihelion) are sufficiently distant from the gravitational influence of Neptune that they are only moderately affected by Neptune and the other known planets: this makes them appear to be "detached" from the Solar System.
The Polyneurini are a tribe of cicadas found in the Palearctic and Indomalaya.
Cercopidae are the largest family of Cercopoidea, a xylem-feeding insect group, commonly called froghoppers . They belong to the hemipteran suborder Auchenorrhyncha.
Heterogastridae is a family of lygaeoid bugs consisting of 23 genera and 97 species.
Flatidae are a family of fulgoroid planthoppers. They are cosmopolitan in distribution and are distinguished from others in the superfamily by a combination of characters. Like all other planthoppers, they suck phloem sap of plants. Some species are known to communicate with vibrations through the plant stems. Communication may be with mates, or with ants that tend the nymphs, protecting them and gathering honeydew secretions. Adults of some species have brightly coloured forewings which are tougher and known as tegmina unlike the membranous hindwings which are used for flight. Although a few can be identified by their coloration, most species requires dissection and examination under a microscope with access to literature on already described species.
A distant minor planet, or distant object, is any minor planet found beyond Jupiter in the outer Solar System that is not commonly thought of as an "asteroid". The umbrella term is used by IAU's Minor Planet Center (MPC), which is responsible for the identification, designation and orbit computation of these objects. As of October 2018, the MPC maintains 3497 distant objects in its data base.
