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 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, which would interact gravitationally but not electromagnetically, would account for the discrepancy.

* Dark matter

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

Further we cannot go, for the Dark ages deserve their name.

According to the TNG Technical Manual, the transporter cannot move antimatter, but in the VOY episode " Dark Frontier " Voyager transported a live photon torpedo equipped with antimatter onto a Borg ship.

In a sense, the Dark Powers are intended to be eternal unknowns, an array of capricious, unforeseeable wills whose motives and actions the player characters cannot hope to understand.

Dark matter is matter that cannot be detected by electromagnetic radiation, hence dark.

The Dark Judges are undead and, as such, cannot be conventionally killed.

Unlike other Rare shooters such as GoldenEye 007 or Perfect Dark, the weapons in Jet Force Gemini feature no magazines and cannot be reloaded after a certain number of shots.

As the Joker prepares to end existence, Superman realizes that, for all his power, the Joker still cannot erase Batman, as the Joker defines himself by his constant opposition to the Dark Knight, allowing Superman to shatter the Joker's control of reality.

Rand thinks he has killed the Dark One, who he believes was Ba ' alzamon, but Moiraine tells him that the Dark One is not human, and therefore cannot have been Ba ' alzamon, because Ba ' alzamon left behind a corpse.

Dark matter is the matter in the universe that cannot be seen.

Later, Hermione explains that although Secrecy Sensors detect jinxes, curses, and Concealment Charms, they cannot detect love potions, as they are not considered Dark.

The Wood Elves cannot be described as morally ' good ' or ' bad ', lacking the clear definition of their cousins, the High Elves and Dark Elves.

Similar to the original Perfect Dark, players cannot jump, even though they have the ability to automatically climb obstacles as long as they can reasonably reach them.

Realizing that he cannot possibly mount an offensive on the Dark One with his forces fighting the Seanchan, he arranges a meeting with the Daughter of the Nine Moons to negotiate a peace, or, lacking that, a truce.

Dark matter is described as being cold ( i. e. its velocity is non-relativistic below the speed of light at the epoch of radiation-matter equality ), non-baryonic ( consisting of matter other than protons and neutrons ), dissipationless ( cannot cool by radiating photons ) and collisionless ( i. e., the dark matter particles interact with each other and other particles only through gravity and possibly the weak force ).

However, all of them realize they cannot save the Digital World without each other, and once the last Dark Master is defeated, Apocalymon reveals himself to be their final enemy.

He holds the boy tight and kills him with affection, because Mr. Dark cannot survive in such close contact with someone good.

Mr. Dark initially holds sway over the other main characters, but his power weakens when Charles uses positive emotions against him, something he cannot comprehend or withstand.

In Legends of the Dark Knight # 6, a cadre of crime bosses projects the signal upside down in order to summon Batman to help them fight a killer they cannot defeat.

However Be ' lal was killed with balefire by Moiraine before he was able to kill Rand, thus he cannot be reincarnated by the Dark One, as his thread is burned out of the Pattern.

But humans cannot be happy for so long and very soon a secret society, the Dark Union, whose members strived for personal power rather than the equality proclaimed by the Bonded, was formed to destroy the Order of the Flame once and for all.

The Dark Zone is the parallel universe that His Divine Shadow cannot enter.

But even the wrath of a god cannot compare to the hatred and spite of the Dark Prince's chief rivals, Demogorgon and Orcus.

The same conclusions can be drawn from the other physical evidence of the Dark ages, from linguistic distribution, and from the survivals of early social, political, and religious patterns into later ages.

Willie's wonderful walloping Sunday -- four home runs -- served merely to emphasize how happy he is to be playing for Alvin Dark.

In the Dark Ages spiders were commonly considered to be a source of contamination of food and water.

Dark energy in its simplest formulation takes the form of the cosmological constant term in Einstein's field equations of general relativity, but its composition and mechanism are unknown and, more generally, the details of its equation of state and relationship with the Standard Model of particle physics continue to be investigated both observationally and theoretically.

Dark energy is also an area of intense interest for scientists, but it is not clear whether direct detection of dark energy will be possible.

This usually takes the form of a list of enemies with short descriptions ( e. g. the Metroid Prime and Castlevania games, as well as Dark Cloud and Final Fantasy ) and may even be central to the plot ( Pokemon 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.

A quantity of more recent bibliographical information can be found at the Bibliography section of the Eldritch Dark site online ( see External Links ).

1984 – 2000 ) has even more potential starting points, but is generally agreed to be the publication of Frank Miller's Batman: The Dark Knight Returns and Alan Moore's Watchmen by DC Comics in 1986, as well as the publication of DC's Crisis on Infinite Earths, written by Marv Wolfman with pencils by George Pérez.

According to Irish mythology, Donn, or the Dark One, is the Lord of the Dead and father of Diarmuid Ua Duibhne, whom he gave to Aengus Óg to be nurtured.

Dark, unsweetened chocolate, caffeine, lemon rind, and some types of fruit are known to be bitter.

If the DNA is to be used after separation on the agarose gel, it is best to avoid exposure to UV light by using a blue light excitation source such as the XcitaBlue UV to blue light conversion screen from Bio-Rad or Dark Reader from Clare Chemicals.

In the 1970s, a harp was common in popular music, and can be heard in such hits as Cher's " Dark Lady ", the intro of " Gypsies, Tramps & Thieves ", and " Boogie Nights " by Heatwave.

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.

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.

A typical year's yield for a maple syrup producer will be about 25 to 30 percent of each of the # 1 colours, 10 percent # 2 Amber, and 2 percent # 3 Dark.

US Grade A Light Amber has to be more than 75 percent translucent, US Grade A Medium Amber has to be 60. 5 to 74. 9 percent translucent, US Grade A Dark Amber has to be 44. 0 to 60. 4 percent translucent, and US Grade B is any product less than 44. 0 percent translucent.

Nintendo has since allowed several mature-content games to be published on its consoles, including: Perfect Dark, Conker's Bad Fur Day, Doom and Doom 64, BMX XXX, the Resident Evil series, killer7, Eternal Darkness: Sanity's Requiem, BloodRayne, Geist and Dementium: The Ward.

The Dark Lady is believed by some Oxfordians to be Anne Vavasour, Oxford's mistress who bore him a son out of wedlock.