Like the nature of dark energy, the nature of dark matter is unknown.
Though most people will insist they have seen this dazzling spectacle, dark skies as nature intended them are rare.
"It's the dark side of human nature, " says Mr. Overton, who has used a wheelchair for 58 years.
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The sequence of woodland vistas, the revelations of scale and distance, light and dark, building and nature, land and water, as one approaches the entrance, were superbly orchestrated by Wright.
One theory that could be explored is that the nature of dark energy, which scientists think is causing the accelerated expansion of the universe, is different from the simplest human-calculated models.
It's the same thing, there's a dark side to human nature, you do get these occasional bad eggs don't you, in any organisation, and that's the business that's got to be controlled.
Well, we still don't quite understand the exact nature of dark matter, but highly precise measurements of positron fraction (the ratio of positrons to electrons and protons) do bring us a small step closer to proving the existence of the theoretical material.
Switchback after switchback finally leads to the telescope itself, where Annis, a Fermilab astrophysicist and colleagues, have been fine-tuning the attached digital camera that offers the next best hope in answering questions about the true nature of dark energy responsible for the inexplicable accelerating expansion of the observable universe.
The point, according to Professor Ofer Lahav, who's the lead investigator for the UK consortium involved in the Dark Energy Survey, is that the nature of all these phenomena is heavily influenced by the properties of dark energy.
So we're looking at this big chunk of the Universe as a way of finding evidence for dark energy and characterising its nature.
Dr Stefanov and his colleagues (or, rather, their computers) looked for the boundaries between densely developed areas, which reflect a lot of light because of all the edges and flat surfaces that people like to create, and those with more vegetation, which appear dark by comparison, as nature prefers curves.
The Standard Model of Particle Physics describes all the known properties of nature (with the exception of dark matter).
And, when you look underneath the science, dark energy is really an undiscovered force of nature that changes how we understand and explain what we observe to be true.
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Moreover, transactions carried out in dark pools effectively become over-the-counter in nature as the prices are not reported and financial risks not effectively managed.
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Meanwhile, the OFES is preoccupied with magnetic fusion research since inertial fusion has always had an uneasy collusion and intertwined nature of being weapons related and living in dark corners of classification and secrecy.
"This will be the largest galaxy survey of its kind, and the galaxy shapes and positions will tell us a great deal about the nature of the physical process that we call dark energy, but do not currently understand, " he said.
Yet from its very nature it has always and everywhere been liable to dark abuses.
Whether or not there is a significant antimatter, or another kind of matter called "dark matter, " is one of the fundamental questions of the origin and nature of the universe that AMS may be able to help answer.
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The reason they have not been noticed by chipmakers, virologists and others who pay attention to things on the micron scale, he contends, is that, like dark matter, they are sensitive only to gravity, and relatively oblivious to the other three of nature's fundamental interactions: electromagnetism and the weak and strong nuclear forces.
Relying on our intuitions alone for self-knowledge is dangerous, because thanks to the nature of the adaptive unconscious, they are often no more accurate than a shot in the dark.
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