Some hypothetical candidates for dark matter
include MACHOs (massive astrophysical compact halo objects), which are larger objects that don't emit any form of radiation, or WIMPs (weakly interacting massive particles), which are exotic particles that don't ordinarily interact with other objects.
Understanding Dark Matter
is essential since without it, the stars and galaxies around us, and even the Earth, would never have formed.
Zooming into the maps, we have measured how dark matter
envelops galaxies of different types and how together they evolve over cosmic time.
And writing in the journal Monthly Notices of the Royal Astronomical Society, the researchers said one dark matter
clump appeared to be lagging behind the galaxy it surrounds.
Galaxy clusters are made of three main ingredients: galaxies, gas clouds, and dark matter
Still, physicists were upbeat, noting that the results eliminated some theoretical candidates for dark matter
A leading theory suggests that dark matter
is composed of exotic particles known as Wimps (weakly interacting massive particles).
Last week, the team reported having detected two energy pulses over the course of a year that stand a good chance of having been caused by dark matter
Scientists operating the LHC - a 27km circumference particle accelerator - hope to trace dark matter
within two years.
International Investment Position" (this issue), Mathew Higgins, Thomas Klitgaard, and Cedric Tille (HKT hence), acknowledge the existence of these intangibles, but argue that dark matter
is unable to account for the difference between the stock and flow data, that the methodology for computing it is doubtful, and that it has no substantive implications for the future evolution of U.
Stella Brite is a young and curious girl who, along with her brother Max, find themselves embarking on an astrophysics detective adventure as they search for mysterious dark matter
that holds the universe together.
When the clusters collided, the volumes of gas were slowed by the impact, but the associated dark matter
from each cluster presumably continued to speed along unimpeded.
Scientists have long suspected that invisible stuff called dark matter
holds galaxies together as they whiz through space.
The astronomers have their cold dark matter
theory--and marketers have "brand equity.
is now available in trade paperback from Warner Aspect Dark Matter
II is coming in January 2003.