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View Full Version : NASA set to "probe" for Dark Energy- Alien Anus's across the universe pucker up in fear of "Probing"


broncosteven
08-19-2010, 11:34 PM
Cosmic Lens Used to Probe Dark Energy for First Time

The full version of this story with accompanying images is at:
http://www.jpl.nasa.gov/news/news.cfm?release=2010-272&cid=release_2010-272

PASADENA, Calif. -- Astronomers have devised a new method for measuring perhaps the greatest puzzle of our universe -- dark energy. This mysterious force, discovered in 1998, is pushing our universe apart at ever-increasing speeds.

For the first time, astronomers using NASA's Hubble Space Telescope were able to take advantage of a giant magnifying lens in space -- a massive cluster of galaxies -- to narrow in on the nature of dark energy. Their calculations, when combined with data from other methods, significantly increase the accuracy of dark energy measurements. This may eventually lead to an explanation of what the elusive phenomenon really is.

"We have to tackle the dark energy problem from all sides," said Eric Jullo, an astronomer at NASA's Jet Propulsion Laboratory, Pasadena, Calif. "It's important to have several methods, and now we've got a new, very powerful one." Jullo is lead author of a paper on the findings appearing in the Aug. 20 issue of the journal Science.

Scientists aren't clear about what dark energy is, but they do know that it makes up a large chunk of our universe -- about 72 percent. Another chunk, about 24 percent, is thought to be dark matter, also mysterious in nature but easier to study than dark energy because of its gravitational influence on matter that we can see. The rest of the universe, a mere four percent, is the stuff that makes up people, planets, stars and everything made up of atoms.

In their new study, the science team used images from Hubble to examine a massive cluster of galaxies, named Abell 1689, which acts as a magnifying, or gravitational, lens. The gravity of the cluster causes galaxies behind it to be imaged multiple times into distorted shapes, sort of like a fun house mirror reflection that warps your face.

Using these distorted images, the scientists were able to figure out how light from the more distant, background galaxies had been bent by the cluster -- a characteristic that depends on the nature of dark energy. Their method also depends on precise ground-based measurements of the distance and speed at which the background galaxies are traveling away from us. The team used these data to quantify the strength of the dark energy that is causing our universe to accelerate.

"What I like about our new method is that it's very visual," said Jullo. "You can literally see gravitation and dark energy bend the images of the background galaxies into arcs."

According to the scientists, their method required multiple, meticulous steps. They spent the last several years developing specialized mathematical models and precise maps of the matter -- both dark and "normal" -- constituting the Abell 1689 cluster.

"We can now apply our technique to other gravitational lenses," said co-author Priya Natarajan, a cosmologist at Yale University, New Haven, Conn. "We're exploiting a beautiful phenomenon in nature to learn more about the role that dark energy plays in our universe."

Other authors of the paper include...:

More here: http://www.jpl.nasa.gov/news/news.cfm?release=2010-272&cid=release_2010-272

elsid13
08-20-2010, 05:13 AM
We know so little on how the universe works.

El Guapo
08-20-2010, 09:39 AM
How do they have time, considering obama is making them look into other domestic issues? hmm...

broncosteven
08-20-2010, 03:11 PM
We know so little on how the universe works.

There was a show on the Science channel about dark energy and dark matter and they showed 2 galaxy's that collided and somehow they mapped the dark energy that was shed from the matter during the collision. Not sure I fully understood how they did that but it was interesting.

elsid13
08-21-2010, 06:06 AM
There was a show on the Science channel about dark energy and dark matter and they showed 2 galaxy's that collided and somehow they mapped the dark energy that was shed from the matter during the collision. Not sure I fully understood how they did that but it was interesting.

Are you watching "through the wormhole" show on Science Channel. It very interesting.