Why register with the Steelers Fever Forums?
 • Intelligent and friendly discussions.
 • It's free and it's quick. Always.
 • Enter events in the forums calendar.
 • Very user friendly software.
 • Exclusive contests and giveaways.

 Donate to Steelers Fever, Click here
 Our 2014 Goal: $450.00 - To Date: $450.00 (100.00%)
 Home | Forums | Editorials | Shop | Tickets | Downloads | Contact Pittsburgh Steelers Forum Feed Not Just Fans. Hardcore Fans.

Go Back   Steelers Fever Forums > Miscellaneous > Locker Room


Steelers Fever Fan Shop

Doc's Sports Get FREE NFL Picks and College Football picks as well as Football Lines like live NFL Lines and updated NFL Power Rankings all at Doc's Sports Service.

Steelers

An important history lesson for you TRUE Steelers fans!

Reply
 
Thread Tools
Old 11-18-2012, 09:44 AM   #1
Vis
In Hoc
Supporter
 
Vis's Avatar
 

Join Date: Mar 2007
Location: SC
Posts: 8,407
Gender: Male
Member Number: 5117
Thanks: 885
Thanked 6,311 Times in 2,985 Posts
My Mood: Devilish
Default BOSS Quasars Unveil a New Era in the Expansion History of the Universe

http://newscenter.lbl.gov/news-relea...arly-universe/


Light from distant quasars (red dots at left) is partially absorbed as it passes through clouds of hydrogen gas. A “forest” of hydrogen absorption lines in an individual quasar’s spectrum (inset) pinpoints denser clumps of gas along the line of sight, and the spectra are collected by the telescope’s spectrograph (square at right). The accessible redshift range corresponds on average to about 10 billion years ago. While the Sloan Digital Sky Survey had previously collected spectra from some quasars in this range, by measuring 10 times as many per square degree of sky BOSS can reconstruct a three-dimensional map of the otherwise invisible gas, revealing the large-scale structure of the early universe.


Tens of thousands of targets for surveying the Lyman-alpha forest of BOSS quasars were selected, and their exact positions plotted, based on imaging and photometric data (the intensity of their light in different colors) from previous phases of the Sloan Digital Sky Survey.


Until recently, three-dimensional maps by BOSS and other surveys were able to measure the regular distribution of galaxies back to an average of only about five and a half billion years ago, a time when the expansion of the universe was already accelerating. BOSS’s quasar measurements (red circle, left), by measuring the distribution of intergalactic gas, have now probed the structure of the early universe at a time when expansion was still slowing under the influence of gravity. The quasar data gives new access to the transition from deceleration to acceleration caused by dark energy.
__________________


All generalizations are dangerous.
Vis is offline   Reply With Quote
Old 11-18-2012, 09:45 AM   #2
Vis
In Hoc
Supporter
 
Vis's Avatar
 

Join Date: Mar 2007
Location: SC
Posts: 8,407
Gender: Male
Member Number: 5117
Thanks: 885
Thanked 6,311 Times in 2,985 Posts
My Mood: Devilish
Default Re: BOSS Quasars Unveil a New Era in the Expansion History of the Universe

Well, damn. Those are big
__________________


All generalizations are dangerous.
Vis is offline   Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -5. The time now is 01:41 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Shoutbox provided by vBShout v6.2.1 (Lite) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging v3.0.8 (Lite) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
Navbar with Avatar by Motorradforum
no new posts