Dark Energy
Related Category: Astronomy: General
repulsive force that opposes the self-attraction of matter (see gravitation) and causes the expansion of the universe to accelerate.
Dark Energy
Dark Energy is a hypothetical form of energy that exerts a negative, repulsive pressure, behaving like the opposite of gravity.
dark energy
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Dark Energy
New results from NASA's Galaxy Evolution Explorer and the Anglo-Australian Telescope atop Siding Spring Mountain in Australia confirm that dark energy (represented by purple grid) is a smooth, ...
Dark energy is a complete mystery to scientists right now and an even bigger problem than dark matter. Though scientists have an idea of what dark matter may be, they haven't figured out what is responsible for dark energy.
Dark energy
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In physical cosmology, dark energy is a hypothetical form of energy that permeates all of space and tends to increase the rate of expansion of the universe.
Tzu-Ching Chang's team developed a new technique called intensity mapping that allows them to study how dark energy has influenced changes in the structure of these filaments of hydrogen over the course of billions of years, ...
dark energy an additional energy needed to make the universe's overall curvature flat. It may be the cosmological constant.
DARK ENERGY - Form of energy that is gravitationally repulsive, due to a negative effective pressure. Dark energy is spread almost uniformly throughout space and appears to contribute about 70% of the present energy density of the universe.
Dark Energy
Dark Halo
(a) The massive outer region of the Milky Way that surrounds the disk and stellar halo. The dark halo consists mostly of dark matter, whose form is unknown.
dark energy
a type of "negative gravity" that seems to play a role in the acceeleration of universal expansion
dark matter ...
dark energy: The energy of empty space that drives the acceleration of the expanding universe.
dark matter: Nonluminous material that is detected only by its gravitational influence.
What Is Dark Energy?
New ideas are what Sean Carroll is all about. Carroll is a theorist. He dreams up ways that an unseen force could be causing the universe to expand faster and faster. That sounds like a challenging job.
dark energy A mysterious source of energy introduced to explain the acceleration of the expansion of the Universe.
Dark energy
A mysterious force that seems to work opposite to that of gravity and makes the universe expand at a faster pace.
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Dark energy
In physical cosmology & astronomy dark energy is a hypothetical form of energy that permeates all of space and tends to increase the Hubble's law....
, is driving the galaxies apart at an ever increasing rate.
Absent dark energy, a flat universe expands forever but at a continually decelerating rate, the rate of expansion asymptotically approaching zero.
Currently, the Dark Energy accounts for about 70% of the enegy density of the universe, while the dark matter is about 25%.
A concept known as dark energy has been proposed as the form that the anti-gravity force takes, energy that exists in a "vacuum". If you remember back to the Big Bang discussion, matter and anti-matter can be made from energy (radiation).
Although Hubble played a critical role in the discovery of dark energy, nearly every major observatory on Earth also contributed to the study of this mysterious energy.
The sum of mass density and the dark energy density determine the future of the universe. The dark energy density is the energy of the vacuum, which is also called the cosmological constant.
g those attributed to "dark energy" or to "dark mass." A study by John Anderson and co-workers at NASA's Jet Propulsion Lab in Pasadena California has analyzed gravity-assist maneuvers by past spacecraft, ...
No one has yet determined what constitutes dark matter, but dark matter and dark energy make up about 96 percent of the known matter and energy in the universe. One McDonald Observatory project will try to measure dark energy.
Given this data we can construct an accelerating model with a flat geometry that is old enough to contain the globular clusters, BUT only if there is a cosmological lambda force, now dubbed "dark energy".
I mean how the heck did 'dark energy' ever become shorthand for 'the universe is expanding with a uniform acceleration'? [click to continue…]
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Last Ever Shuttle Journeys out to the Launch Pad; Photo Gallery ...
The contents of the universe include 4 percent atoms (ordinary matter), 23 percent of an unknown type of dark matter, and 73 percent of a mysterious dark energy.
[10.2] COSMIC DARK MATTER / DARK ENERGY / MULTIVERSE THEORIES
[10.3] TO THE EDGE OF THE UNIVERSE
[10.4] COMMENTS, SOURCES, & REVISION HISTORY ...
The Photoelectric Effect - explanation of the photoelectric effect
The Photoelectric Effect - explanation of the photoelectric effect
The Compton Effect - an introduction to the Compton effect
Dark Energy - definition of dark energy ...
Physics and Astronomy: Anisotropy (or Anisotropic), Baryonic dark matter, Big bang nucleosynthesis, Blackbody, Black dwarf, Cold dark matter, Dark energy, Greisen-Zatsepin-Kuzmin limit, History of astronomy, Hubble's law, ...
Estimated distribution of dark matter and dark energy in the universe.
Image credit: NASA ...
Missing mass- several seperate experiments show that there is more matter in the universe than we can see; more than that, this so-called "dark matter" accounts for about 25% of the universe's total mass-energy, but there is a "dark energy" ...
The supernova data combined with information from other cosmological studies strongly suggest that the Universe is filled with an unidentified form of energy (currently being called "dark energy" since we know nothing about it) that is causing the ...
 See also: Energy, Universe, Dark Matter, Time, Light
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