But other researchers have questioned attributing these seasonal variations that have been detected to dark matter.
BBC: Dark Matter: Experiment to shed light on dark particles
Some experiments claim to have seen signals of dark matter in the form of annual modulation.
BBC: Dark Matter: Experiment to shed light on dark particles
Erected in 1928, its interiors are opulent, with heavy silk curtains, porcelain antiques and dark-wood furniture.
In some cases, these dark pools allow outsiders entry to increase their order flow.
Eight young women squirm under electrode-studded caps in a dark, small room in Greenwich, England.
Add their French-born children, and the proportion of the dark-skinned is a lot higher still.
But councils are not the only ones being kept in the dark by the latest initiative.
And nothing compares to the thrill of being in this jungle environment after dark.
Heart-stopping switchbacks plummeted downwards between dark cliffs into a gorge cut by the Khunjerab River.
The trees, however, were bare, creating dark, bleak silhouettes against an anaemic winter sky.
Morocco are one of the dark horses of the World Cup and were unbeaten during their qualification.
When we climbed down a rickety ladder into the dark chamber, the smell of damp was overwhelming.
Lino is as thin as a whippet, all sinew and lean muscle, and dark with the sun.
The cries met each other almost directly above me, 20 or 30 feet up in the dark.
Beautiful hand-carved panels, dark wood, vintage tea canisters and red lanterns create a soft and elegant atmosphere.
But for the other half it will be moving with this tide and less dark matter will hit.
BBC: Dark Matter: Experiment to shed light on dark particles
In its own dark way, the movie is a big wet kiss to the city by the bay.
Just after dark every night, two hyena men begin their ritual at sites just outside the city walls.
When you walk away again, they go dark, the handles retract and the car enters its stealth mode.
Emerging from a dark and yew-rich wood, I reached an open down that stretched ahead for two miles.
"Dark Sky Reserves are a big deal for stargazing, " explained Chris Bramley, editor of Sky at Night magazine.
There was also a slight undertone of dark porter beer, which Red Apron uses in the emulsion process.
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In 1996, I attended a conservative conference called Dark Ages at the Phoenix Biltmore resort.
Then the lights went out and voila, the white outfits glowed in the dark.
On the morning of December 6, 1986, Judy Bishop got up while it was still dark.
Let's just accept this as a fact, acknowledge those were the dark days and move on.
The offenders then left the scene of the shooting in a dark coloured hatchback car.
Yet from its very nature it has always and everywhere been liable to dark abuses.
There are the typical golden styles like pilsner, or pils, and dark versions such as dunkel.
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