See also
This article includes an astronomy-related list of lists.
This is a list of lists of black holes :
A black hole is a region of spacetime where gravity is so strong that nothing, not even light and other electromagnetic waves, is capable of possessing enough energy to escape it. Einstein's theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole. The boundary of no escape is called the event horizon. A black hole has a great effect on the fate and circumstances of an object crossing it, but it has no locally detectable features according to general relativity. In many ways, a black hole acts like an ideal black body, as it reflects no light. Quantum field theory in curved spacetime predicts that event horizons emit Hawking radiation, with the same spectrum as a black body of a temperature inversely proportional to its mass. This temperature is of the order of billionths of a kelvin for stellar black holes, making it essentially impossible to observe directly.
A supermassive black hole is the largest type of black hole, with its mass being on the order of hundreds of thousands, or millions to billions, of times the mass of the Sun (M☉). Black holes are a class of astronomical objects that have undergone gravitational collapse, leaving behind spheroidal regions of space from which nothing can escape, including light. Observational evidence indicates that almost every large galaxy has a supermassive black hole at its center. For example, the Milky Way galaxy has a supermassive black hole at its center, corresponding to the radio source Sagittarius A*. Accretion of interstellar gas onto supermassive black holes is the process responsible for powering active galactic nuclei (AGNs) and quasars.
In general relativity, a white hole is a hypothetical region of spacetime and singularity that cannot be entered from the outside, although energy-matter, light and information can escape from it. In this sense, it is the reverse of a black hole, from which energy-matter, light and information cannot escape. White holes appear in the theory of eternal black holes. In addition to a black hole region in the future, such a solution of the Einstein field equations has a white hole region in its past. This region does not exist for black holes that have formed through gravitational collapse, however, nor are there any observed physical processes through which a white hole could be formed.
In physics, black hole thermodynamics is the area of study that seeks to reconcile the laws of thermodynamics with the existence of black hole event horizons. As the study of the statistical mechanics of black-body radiation led to the development of the theory of quantum mechanics, the effort to understand the statistical mechanics of black holes has had a deep impact upon the understanding of quantum gravity, leading to the formulation of the holographic principle.
A galaxy is a system of stars, stellar remnants, interstellar gas, dust, dark matter, bound together by gravity. The word is derived from the Greek galaxias, literally 'milky', a reference to the Milky Way galaxy that contains the Solar System.
This is a list of lists, grouped by type of astronomical object.
A black hole is a region of extreme gravitational pull.
Omega Centauri is a globular cluster in the constellation of Centaurus that was first identified as a non-stellar object by Edmond Halley in 1677. Located at a distance of 17,090 light-years, it is the largest known globular cluster in the Milky Way at a diameter of roughly 150 light-years. It is estimated to contain approximately 10 million stars, with a total mass of 4 million solar masses, making it the most massive known globular cluster in the Milky Way.
NGC 6397 is a globular cluster in the constellation Ara that was discovered by French astronomer Nicolas-Louis de Lacaille in 1752. It is located about 7,800 light-years from Earth, making it one of the two nearest globular clusters to Earth. The cluster contains around 400,000 stars, and can be seen with the naked eye under good observing conditions.
"Black Hole Sun" is a song by American rock band Soundgarden. Written by frontman Chris Cornell, the song was released in 1994 by A&M Records as the third single from the band's fourth studio album, Superunknown (1994). Considered to be the band's signature song, it topped the US Billboard Album Rock Tracks chart, where it spent a total of seven weeks at number one. Despite peaking at number two on the Billboard Modern Rock Tracks chart, "Black Hole Sun" finished as the number-one track of 1994 for that listing. Worldwide, the single reached the top 10 in Australia, Canada, France, and Ireland, while in Iceland, it reached number one.
Songs from the Black Hole is an unfinished album by the American rock band Weezer, recorded between 1994 and 1996. The songwriter, Rivers Cuomo, conceived it as a rock opera that would express his mixed feelings about the success of Weezer's 1994 self-titled debut album. Its characters were to be voiced by members of Weezer, plus the guest vocalists Rachel Haden and Joan Wasser.
Black Hole Recordings is a Dutch record label founded by Tijs Verwest (Tiësto) and Arny Bink in 1997. In August 2009, Tiësto decided to leave Black Hole Recordings, setting up the record label Musical Freedom in association with PIAS Entertainment Group.
Black Holes and Revelations is the fourth studio album by English rock band Muse, first released on 3 July 2006 through Warner Bros. Records and Muse's Helium-3 imprint. It was produced by Rich Costey over four months in New York City, London, Milan and southern France.
In networking, a black hole refers to a place in the network where incoming or outgoing traffic is silently discarded, without informing the source that the data did not reach its intended recipient.
The Black Hole of Calcutta was a dungeon in Fort William, Calcutta, measuring 14 by 18 feet, in which troops of Siraj-ud-Daulah, the Nawab of Bengal, held British prisoners of war on the night of 20 June 1756. John Zephaniah Holwell, one of the British prisoners and an employee of the East India Company, said that, after the fall of Fort William, the surviving British soldiers, Indian sepoys, and Indian civilians were imprisoned overnight in conditions so cramped that many people died from suffocation and heat exhaustion, and that 123 of 146 prisoners of war imprisoned there died.
In loop quantum gravity theory, a Planck star is a hypothetical astronomical object, theorized as a compact, exotic star, that exists within a black hole's event horizon, created when the energy density of a collapsing star reaches the Planck energy density. Under these conditions, assuming gravity and spacetime are quantized, a repulsive "force" arises from Heisenberg's uncertainty principle. The accumulation of mass–energy inside the Planck star cannot collapse beyond this limit because it violates the uncertainty principle for spacetime itself.