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The term bolide (from the Greek βολις, bolis, missile) can refer to either an extraterrestrial body that collides with the Earth, or to an exceptionally bright, fireball-like meteor regardless of whether it ultimately impacts the surface. ...more on Wikipedia about "Bolide"
Deep sky object (DSO) is a term used often in amateur astronomy to denote objects in the night sky other than solar system objects (such as planets, comets and asteroids), single stars and multiple star systems. With a few exceptions such as the Andromeda galaxy, these objects are not visible with the naked eye. The brighter ones can be seen with a small telescope or with a good pair of binoculars, and many DSOs can be photographed through small telescopes with extended exposure times. For visual observation in good clarity a larger telescope is required. ...more on Wikipedia about "Deep sky object"
A galaxy is a huge gravitationally bound system of stars, interstellar gas and dust, plasma, and (possibly) unseen dark matter. Typical galaxies contain 10 million to one trillion (107 to 1012) stars, all orbiting a common center of gravity. In addition to single stars and a tenuous interstellar medium, most galaxies contain a large number of multiple star systems and star clusters as well as various types of nebulae. Most galaxies are several thousand to several hundred thousand light years in diameter and are usually separated from one another by distances on the order of millions of light years. ...more on Wikipedia about "Galaxy"
Intergalactic space is the physical space between galaxies. Generally free of dust and debris, intergalactic space is very close to a vacuum. The average density of the Universe is less than one atom per cubic meter. The density of the Universe, however, is clearly not uniform; it ranges from relatively high density in galaxies (including very high density in structures within galaxies, such as planets, stars, and black holes) to extremely rarified conditions in vast voids that have lower density than the Universe's average. Surrounding and stretching between galaxies, there is a rarified gas that is thought to possess a cosmic filamentary structure and that is slightly denser than the average density in the Universe. This material is called the intergalactic medium (IGM) and is mostly ionized hydrogen (i.e. a plasma) consisting of equal numbers of electrons and protons. The IGM is thought to exist at a density of 10 to 100 times the average density of the Universe -- which implies the mass of 10 to 100 hydrogen atoms per cubic meter. ...more on Wikipedia about "Intergalactic space"
In astronomy, the interstellar medium (or ISM) is the matter and energy content that exists between the stars within a galaxy. The ISM plays a crucial role in astrophysics precisely because of its intermediate role between stellar and galactic scales. Stars form within the densest regions of the ISM, molecular clouds, and replenish the ISM with matter and energy through planetary nebulae, stellar winds, and supernovae. In turn, this interplay between stars and the ISM helps determine the rate at which a galaxy depletes its gaseous content, and therefore its lifespan of active star formation. ...more on Wikipedia about "Interstellar medium"
The Magellanic Bridge is a stream of neutral hydrogen that links the two Magellanic Clouds. ** It is mostly a low- metallicity gas feature, though a few stars have been found inside it. ** It should not be confused with the Magellanic Stream, which links the MCs to the Milky Way. ...more on Wikipedia about "Magellanic Bridge"
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SHGb02+14a is a radio emitted frequency. It is a source and a candidate in the Search for Extra-Terrestrial Intelligence discovered on March 2003 by SETI@home and announced in New Scientist on September 1, 2004. ...more on Wikipedia about "Radio source SHGb02+14a"
A star is a massive body of plasma in outer space that is currently producing or has produced energy through nuclear fusion. Unlike a planet, from which most light is reflected, a star emits light because of its intense heat. Scientifically, stars are defined as self-gravitating spheres of plasma in hydrostatic equilibrium, which generate their own energy through the process of nuclear fusion. Stellar astronomy is the study of stars. ...more on Wikipedia about "Star"
VIRGOHI21 is a dark matter halo in the Virgo cluster. It is the size of a galaxy, but apparently contains no stars. It was detected through H-I emissions of neutral hydrogen (21 cm emissions) in the dark galaxy. This is the first discovery of the postulated dark matter clumps and galaxies anticipated by dark-matter theories. ...more on Wikipedia about "VIRGOHI21"
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Astronomical objects