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

Dark energy has been proposed to explain this.

Dark energy now dominates the energy of the universe, in contrast to earlier epochs when it was insignificant.

As Dark Willow boasts of her indestructibility, Giles knocks her to the floor with a blast of magic energy, saying " I'd like to test that theory " (" Two to Go ").

* Dark energy star, a hypothetical alternative to black holes

* Dark energy

* Dark energy

* Hubble Space Telescope measurements show that " Dark energy " is pushing apart the universe ; this appears to be the constant, repulsive force that Albert Einstein once predicted.

# REDIRECT Dark energy

He tells Samus that after a meteor struck Aether, a strange energy emanating from it created another image of Aether called Dark Aether, which hosted a deadly and aggressive species called Ing.

Samus defeats the creature and retrieves the last remaining energy as Dark Aether collapses ; however, her path out of the temple is blocked by a horribly altered and unstable Dark Samus.

On the Dark Fortress, Andros finds Zordon, who requests his energy tube be shattered.

When Dark Specter is killed in the finale, she becomes the " Queen of Evil ", she is seemingly killed accidentally during a confrontation with Andros, but is revived by Zordon's energy wave.

Dark materials and the enclosed canyons created by city buildings trap more of the sun ’ s energy.

It is the instrument chosen to be used to execute the Dark Energy Survey, a massive undertaking to image a large part of the sky to faint light levels, detecting galaxy large scale structure as a function of look back time to shed light on the nature of dark energy.

Dark energy has heat and kinetic damage, and due to the nature of this sort of exotic matter, it causes normal matter to vaporize and cease to exist.

Dark energy corresponds to a force between the branes, and serves the crucial role of solving the monopole, horizon, and flatness problems.

Publishers Weekly reviewed it as "... The author's imagination runs wild as he conjures some striking imagery (" Dark threads of energy moved through her veins and leaped from her fingertips " says one of the three women in the opening scene ) and cooks up a surreal stew of character portraits ( rendered in bold colors and brushwork, they resemble some of Van Gogh's later work ).

While the armies fought, Autobot strike teams sabotaged the fortress, draining it of energy and causing it to fall into a Dark Nebula.

The telescope was upgraded for use in the Hobby-Eberly Telescope Dark Energy Experiment ( HETDEX ), which will provide the first observations to allow narrowing of the list of possible explanations for dark energy.

Throughout the Dark ages, it is clear, the Greek world had been developing slowly but consistently.

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

" The Dark " or " Misty Hel ") This realm is roughly analogous to Greek Tartarus.

The place-name itself is Pictish, implying an origin in the Dark Ages: aber ' confluence '.

He is one of ten San Francisco Giants to appear on the cover, along with Kelly Downs, Rick Reuschel, Willie Mays ( nine times ), Alvin Dark, Juan Marichal, Will Clark, Tim Lincecum ( twice ), Brian Wilson, and Buster Posey.

After he becomes Clayface, he is then replaced by Ellen Yin ( also based on The Dark Knight Returnss character Ellen Yindel ).

* The concluding scene in The Dark Knight, where Two-Face holds Gordon's family at gunpoint, is reminiscent of the Year One scene where Gordon's family is at danger from The Roman and Loeb's men.

This journal was continued under a new title but with the numbering continued from No 1, thus the first issue of The Dark Eidolon: The Journal of Smith Studies, ( Necronomicon Press ) is numbered " 2 " ( it appeared June 1989 ).

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.

" People of the Dark " is a remembrance story of " past lives ", and in its first-person narrative the protagonist describes one of his previous incarnations: Conan, a black-haired barbarian hero who swears by a deity called Crom.

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 ".

A clerihew much appreciated by chemists is cited in Dark Sun by Richard Rhodes regarding the inventor of the thermos bottle ( or Dewar flask ):

Dark chocolate is produced by adding fat and sugar to the cacao mixture.

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

A well-known example of a non – carbon-based life-form in science fiction is the Horta in the original Star Trek episode " Devil in the Dark ".

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.

The popularity of Star Wars-themed WADs is rumored to have been the factor that prompted LucasArts to create their first-person shooter Dark Forces.

* Stephen King's The Dark Tower series mentions Discordia in several contexts ; one of the main characters, Mordred Deschain, is from Discordia, and the castle that is home to the main antagonist is called Castle Discordia.

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