In cosmology, dark energy is a hypothetical form of energy which

permeates all of space and has strong negative pressure. According to

the theory of relativity, the effect of such a negative pressure is

qualitatively similar to a force acting in opposition to gravity at

large scales. Invoking such an effect is currently the most popular

method for explaining recent observations that the universe appears to

be expanding at an accelerating rate, as well as accounting for a

significant portion of the missing mass in the universe.

Two proposed forms for dark energy are the cosmological constant, a

constant energy density filling space homogeneously, and quintessence,

a dynamic field whose energy density can vary in time and space.

Distinguishing between the alternatives requires high-precision

measurements of the expansion of the universe to understand how the

speed of the expansion changes over time. The rate of expansion is

parameterized by the cosmological equation of state. Measuring the

equation of state of dark energy is one of the biggest efforts in

observational cosmology today.

Adding a cosmological constant to the standard theory of cosmology

(i.e. the FLRW metric) has led to a model for cosmology known as the

Lambda-CDM model. This model agrees closely with established

cosmological observations.

As NASA reports indicate, 70 percent or more of the universe consists

of dark energy, about which we know next to nothing.

At the beginning of March, 2006 the satellite of China National Space

Administration, DARKSTAR started operations, observing in neutrino the

solar corona.

It results a sensational information that our system also contains

dark energy. This substance is located within the solar surface.

We have placed above cosmological information into our screensaver and you

can view allocation of dark matter in our Solar system!