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The universe was believed to be expanding, but ever more slowly due to the inexorable pull of gravity. Since then scientists have discovered that universal expansion is accelerating. This suggests a source of energy countering gravity--a kind of 'negative' gravity. Dark matter is defined as matter in outer space that does not emit detectable radiation such as light. It is estimated to represent up to 25 percent of all matter. Associated with matter is energy. "Dark energy" is believed to represent about 70 percent of the universe. Since communication with the outer reaches of space requires the detection of radiation in one form or another, at present, dark matter can only be implied. This means that it is still in the theoretical stage. Space was once considered essentially nothingness. Such is no longer the case. Chandra Observatory informs us that there may be a kind of energy associated with empty space---vacuum energy---which exerts a repulsive force. Although they are different entities, force and energy bear a close relationship. Where there is gravity, attractive or repulsive, there must be available energy. The theory of dark matter and the theory of the energy of empty space are not necessarily mutually exclusive. If one or both holds true, they represent an energy source of considerable size. Study of Vacuum Energy Physics for Breakthrough Propulsion (PDF) The Structured Vacuum--Thinking About Nothing (PDF) Research on Galactic Dark Matter Implied by Gravitational MicrolensingDark Matter
Only a Theory
Another Theory
Gravitational Force and Energy
Not Mutually Exclusive
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by Twisted Taco on February 16th, 2010
No, dark matter is what comes out after a Mexican refried bean lunch
by Possimpable on February 16th, 2010
While our best minds are hard at work on this, dark matter and dark energy are not well understood, and the theory emerged as a fudge factor for large scale gravitational simulations of Sloan survey data.
by Im Alec has abandoned this account on February 14th, 2010
Not so far as we can tell. But since all we know for certain about Dark Matter is that it is there and is affected by gravity (and its gravity affects normal matter), we really cannot say what it might be useful for.
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