Loving the thought of this.
On Sun, Jul 25, 2010 at 8:02 PM, Mr. Worf hellomahog...@gmail.com wrote:
The Search for Dark Energy has a New Weapon
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http://news.discovery.com/contributors/nicole-gugliucci/ Analysis by Nicole
Gugliucci http://news.discovery.com/contributors/nicole-gugliucci/
Sat Jul 24, 2010 03:10 PM ET
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[image:
Dark-matter-energy-625x450]http://blogs.discovery.com/.a/6a00d8341bf67c53ef0133f279c262970b-pi
The nature of dark
energyhttp://news.discovery.com/space/one-step-closer-to-understanding-dark-energy.htmlis
one of the outstanding problems in cosmology today.
*Something* is causing the universe's expansion to accelerate, but what?
Numerous techniques are being developed to attack this problem, and
astronomers have demonstrated such a technique with the largest
fully-steerable radio telescope http://www.nrao.edu/pr/2010/highzhi/.
*SLIDE SHOW: Visualizing the inner workings of a Type Ia supernova -- the
standard candle astronomers use to measure the effects of dark
energy.http://news.discovery.com/space/argonne-supernova-simulation.html
*
[image: Dark-energy] *WATCH VIDEO: James Williams investigates the
mysteries behind a dark force in the universe: dark
energy.*http://news.discovery.com/videos/space-study-sheds-light-on-dark-energy.html
Theories predict that acoustic, or sound waves, from the very early
universe should have left their mark in a detectable way. (What if you could
hear these
soundshttp://www.astro.virginia.edu/%7Edmw8f/BBA_web/index_frames.html?)
By measuring the large-scale structures left behind by the sound waves,
astronomers may be able to make precise measurements of some of the
parameters of dark energy http://news.discovery.com/dark-energy/, thus
getting one step closer to determining its nature.
Astronomers Tzu-Ching Chang, Jeffrey Peterson, Ue-Li Pen, and Kevin Bandura
used the Green Bank Telescope in West Virginia to map large, faint
structures of hydrogen gas. Hydrogen is the most common element in the
galaxy, and hydrogen atoms give off a characteristic color of radio light.
As they map the hydrogen in the universe on the largest scales, astronomers
can search for the structures created by the universe's characteristic sound
waves.
However, mapping the most abundant element in the universe in this way
isn't the easiest task. The team developed new techniques of mapping the
faint hydrogen, as well as methods for removing stray radio interferences
from man-made sources and from astronomical sources in the foreground. The
work paid off as they detected hydrogen ten times further than had been done
before.
To unlock the universe's deepest secrets, astronomers find themselves
working harder to find more clever techniques in order to detect fainter and
more elusive signals. But isn't it the challenge that makes it more fun?
*Caption: Computer simulation of large scale structure. Credit: Science
Magazine*
--
Celebrating 10 years of bringing diversity to perversity!
Mahogany at: http://groups.yahoo.com/group/mahogany_pleasures_of_darkness/
--
If all the world's a stage and we are merely players, who the bloody hell
wrote the script? -- Charles E Grant
http://www.youtube.com/watch?v=fQUxw9aUVik
