Dark matter has never been detected in the laboratory, and the particle physics nature of dark matter remains completely unknown.

# REDIRECT Dark matter

* Dark star ( dark matter ), a star heated by annihilation of dark matter particles within it

Dark matter cannot be seen directly with telescopes ; evidently it neither emits nor absorbs light or other electromagnetic radiation at any significant level.

Dark matter is estimated to constitute 84 % of the matter in the universe and 23 % of the mass-energy.

Dark matter came to the attention of astrophysicists due to discrepancies between the mass of large astronomical objects determined from their gravitational effects, and the mass calculated from the " luminous matter " they contain ; such as stars, gas and dust.

Dark matter's existence is inferred from gravitational effects on visible matter and gravitational lensing of background radiation, and was originally hypothesized to account for discrepancies between calculations of the mass of galaxies, clusters of galaxies and the entire universe made through dynamical and general relativistic means, and calculations based on the mass of the visible " luminous " matter these objects contain: stars and the gas and dust of the interstellar and intergalactic medium.

Dark matter plays a central role in state-of-the-art modeling of structure formation and galaxy evolution, and has measurable effects on the anisotropies observed in the cosmic microwave background.

There are three prominent hypotheses on nonbaryonic dark matter, called Hot Dark Matter ( HDM ), Warm Dark Matter ( WDM ), and Cold Dark Matter ( CDM ); some combination of these is also possible.

The most widely discussed models for nonbaryonic dark matter are based on the Cold Dark Matter hypothesis, and the corresponding particle is most commonly assumed to be a weakly interacting massive particle ( WIMP ).

Dark matter can explain the ' flat ' appearance of the velocity curve out to a large radius

Dark matter appears to account for around 90 % of the mass of most galaxies.

Dark matter gravitates as ordinary matter, and thus works to slow the expansion of the universe ; by contrast, dark energy accelerates its expansion.

Category: Dark matter

* Dark matter

At one point, Dark Helmet taunts him into action by saying, " What's the matter, Colonel Sandurz?

Patchen envisions a Dark Kingdom which `` stands above the waters as a sentinel warning man of danger from his own kind ''.

She read Maitland's Dark Ages, `` which I enjoyed very much '' ; ;

Most of the Project's titles, especially the early work, share common traits ( likely influenced by Pink Floyd's The Dark Side of the Moon, on which Parsons was the audio engineer in 1973 ).

It was eventually followed by another sequel, The Dark Knight Rises ( 2012 ), which serves as a conclusion to Nolan's film series.

The range of times and places in which the horrors of the Mythos can be encountered was also expanded in late 2005 onwards with the addition of Cthulhu Dark Ages by Stéphane Gesbert, which gives a framework for playing games set in eleventh-century Europe, Secrets of Japan by Michael Dziesinski for gaming in modern day Japan, and Secrets of Kenya by David Conyers for gaming in interwar period Africa.

There is also a track on the accompanying EP Vempire or Dark Faerytales in Phallustein titled " Queen Of Winter Throned " which contains the lyrics: " Iniquitous / I share Carmilla's mask / A gaunt mephitic voyeur / On the black side of the glass ".

Dark chocolate, with its high cocoa content, is a rich source of epicatechin and gallic acid, which are thought to possess cardioprotective properties.

Pink Floyd recast itself from its 1960s guise as a psychedelic band into a commercial success with its series of concept albums, most famously with The Dark Side of the Moon ( which, according to the RIAA, is the second best selling album in history ) and later with the double album rock opera The Wall.

Heavy metal band Iced Earth, released their 1996 album The Dark Saga which is based upon the comic book character Spawn, created by Todd McFarlane.

At La Martinique, playwright Moss Hart saw Danny perform, which led to Hart casting him in Hart's hit Broadway comedy Lady in the Dark.

He refers to British director Christopher Nolan ’ s The Dark Knight and Inception as British rather than as American films, and yet " when a movie which looks quintessentially ‘ British ’, such as The King's Speech, achieves equivalent success, everyone suddenly starts writing articles about the state of our national cinema as if it somehow exists in isolation.

Several centuries later, in late Dark Age Europe, the term " firearm " was used in Old English to denote the arm in which the match was held that was used to light the touch hole on the hand cannon.

In 1988 Dark Horse Comics released a six-issue limited series, Godzilla, which was an American adaptation of the Japanese manga adaptation of The Return of Godzilla.

* Dark Fire, a novel by C J Sansom in which Greek fire plays a prominent part

The final level of the expansion, the Dark Citadel itself, is an arena-like level, which features teleporting waves of monsters and three bosses ( Fighter, Cleric, and Mage clones ).

Fantasy author Philip Pullman echoes this idea in the fantasy series His Dark Materials, in which the characters finally come to the conclusion that people should make life better on Earth rather than wait for heaven ( this idea is known as the Republic of Heaven ).

Other successes followed, including To Have and Have Not ( 1944 ); The Big Sleep ( 1946 ); Dark Passage ( 1947 ) and Key Largo ( 1948 ), with his wife Lauren Bacall ; The Treasure of the Sierra Madre ( 1948 ); In a Lonely Place ( 1950 ); The African Queen ( 1951 ), for which he won his only Academy Award ; Sabrina ( 1954 ); and The Caine Mutiny ( 1954 ).

Dark Victory ( 1939 ) was one of the last films in which he played a supporting role

This view of the Force is related to the Potentium, which claims that there is no Dark Side inherent in the Force, only in the user.

She has faced death numerous times in the history of the series, the first being when, in her guise as Marvel Girl, she died and was " reborn " as Phoenix, which in time led to her second-though not last-death in the classic " Dark Phoenix Saga ".

Von Trier has stated he was inspired to make a trilogy about the United States as a reaction to Americans at the Cannes film festival who said he had no right to make the Dancer in the Dark, which was often viewed as being critical of a country he has never been to ( and has no intention of ever visiting, due to his phobia of travel ); however, von Trier himself has stated in interviews he did not intend it to be a criticism of America, saying the film takes place in a " fictional America ".

Ultimately, it would be A Shot in the Dark, three years later, which would boast the longest run.

Disdaining what he believed to be the ignorance of the centuries preceding the era in which he lived, Petrarch is credited with creating the concept of a historical " Dark Ages ".

The surname Stark was later used in King's novel The Dark Half, in which an author's malevolent pseudonym, " George Stark ", comes to life.

Carpenter had just made Dark Star but no one wanted to hire him as a director, so he assumed that he would make it in Hollywood as a screenwriter.

Dark skin probably evolved after humans lost their body fur, because the naked skin was vulnerable to the strong UV radiation as would be experienced in Africa.

Examples would be: Tolkien's Morgoth of The Silmarillion as well as Sauron, the King of the Nazgûl and the others of the Nine Riders from The Lord of the Rings, Lord Voldemort from Harry Potter series, Lasky's Kludd and Nyra of Guardians of Ga ' Hoole, Brooks's Warlock Lord of The Sword of Shannara, Jordan's Dark One of The Wheel of Time, and Eddings ' Torak of The Belgariad and Zandramas of The Malloreon, Rick Riordan's Kronos of Percy Jackson and the Olympians, Goodkind's Darken Rahl and Emperor Jagang of The Sword of Truth, Dart-Thornton's Moragon, and Paolini's Galbatorix of The Inheritance Cycle.

The band's first involvement was on the 1994 demo of " Dark & Gray " on his Bootleg Series Tapes, they would make three more appearances on the tapes in Watch Me Come, Only a Dog and Box # 10.

On February 16, 2010, King announced on his website that his next book would be a collection of four previously unpublished novellas called Full Dark, No Stars.

Others would argue that such references to the Dark Ages are not relevant to a modern region defined by its geography.

Whilst the violence undoubtedly reflected disenchantment with the economic decline and lack of social services, it would be wrong to construe this period as a form of " Dark Ages " for the Territory.

In this token, a man from the Dark Ages living in Classical Antiquity, or the opposite, would undergo a gulping sadness and agony.

The character would be featured in the opening of every film in the movie series except A Shot in the Dark and Inspector Clouseau.

Under the influence of the medicine man White Bull ( also called Ice ) and Grey Beard ( also called Dark ), the Cheyenne went into battle believing that strong spiritual medicine would prevent the soldiers ' guns from firing.

It was presumably lost at the fall of Sauron, but since the Stones are virtually indestructible, it would still be buried in the wreckage of the Dark Tower, or ( as Christopher Tolkien speculates in Unfinished Tales ) destroyed by the eruption of Orodruin.

During the Third Age, recognizing that an outright confrontation with Sauron ( Melkor's beloved Maia ) would be disastrous, the Valar sent the Istari to Middle-earth with the intent of giving counsel to Men in their resistance to the growing power of the Dark Lord.

There Turgon decided to found a great city, designed after the city of Tirion in Valinor that the Noldor had left when they went into exile, that would be protected by the mountains and hidden from the Dark Lord Morgoth.

In an interview with CBR News, Shooter, who previously oversaw publication of these characters at Valiant Comics, indicated that Dark Horse's versions of the characters would be both true to the original source material, but also exhibit some variation from the Gold Key and Valiant versions.

He attempts to acquire a legendary crystal that would allow him to wield even greater power, but, although Moriarty acquires the crystal, boosting his powers and healing his injuries, he is defeated when it is revealed that Holmes is partly possessed by the spirit of the Dark One's old rival, allowing Holmes to wield similar powers to Moriarty's and delay him long enough for Holmes's ally, Huree Chunder Mockerjee, to knock the crystal away from Moriarty and into Holmes's hands, allowing Holmes to turn Moriarty's powers against him, vaporising his body and destroying him once and for all.

In the Maha Samaya Sutta, the defeated antagonist of the Buddha, Mara also known as " Namuci " or the " Dark One " is described as an Asura whose army consisted of " Sensual passions, Discontent, Hunger and Thirst, Craving, Sloth and Drowsiness, Terror, Uncertainty, Hypocrisy and Stubbornness, Gains, Offerings, Fame and Status wrongly gained, and whoever would praise self and disparage others " ( Sn 3. 2 Padhana Sutta ).

Decades later, noted comic book writer Dennis O ' Neil would have the two Dark Knights meet up in Batman # 253 ( November 1973 ) and Batman # 259 ( December 1974 ) to solve crimes.

Two centuries earlier a Welsh seer, Robin Ddu (" Robin the Dark ") said the roof on the refectory would do very nicely on a little church under Moel Famau.

The projected railroad, under a preliminary survey made in 1894, would have extended the road southeast along Dark Shade Creek and Shingle Run valleys, across the mountain by way of Frazier's Gap, into Bedford County and eastward to the Atlantic seaboard.

During his long tenure in the midst of the surrounding political chaos of the Greek Dark Ages, Egypt was beset by foreign invaders ( including the so-called Sea Peoples and the Libyans ) and experienced the beginnings of increasing economic difficulties and internal strife which would eventually lead to the collapse of the Twentieth Dynasty.

For many years Les Paul would sometimes surprise radio hosts Steve King and Johnnie Putman with a call to the " Life After Dark Show " on WGN ( AM ) in Chicago.