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wiki Word: Dark
Matter
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Definition: Dark Matter is a form of matter that does not produce or reflect enough electromagnetic radiation (light, radio waves, infrared radiation, X-rays, and gamma rays) to be directly observed. Its presence is known by the way its gravity affects objects around it. |
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Dark Matter makes up the vast majority of matter in universe. Some things that give evidence of the existence of Dark Matter are the rotational speeds of galaxies, the orbital velocities of superclusters, gravitational lensing (when the light of a very distant object is bent around an extremely massive object), and the temperature distribution of hot gas throughout galaxies. It's still a very mysterious and we don't know much about it. Some studies have predicted that the life of dark matter articles are 3.000.000 billion years old!!!
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1. Distibution of Dark Matter and Dark energy throughout the universe (Dark energy is not matter)
  2. Dark Matter is the black stuff 3. Mass distribution in the cluster CL0024. This detailed dark matter distribution can be used to constrain theories of dark matter. Strong lensing of a background galaxy was inverted to yield a model for the mass distribution. |
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Dark Matter is a very important thing to know about just because of how big it is! It accounts for about 90% of all the mass in the universe. Dark Matter is the explanation for the way many things behave in space. We know Dark Matter exists because of the way these things around it act. If we didn't know about Dark Matter or simply never thought up of the concept, we wouldn't understand a very large chunk of astronomy like we do today. Obviously, if something that big exists, it's going to be important.
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1. "Dark matter." Wikipedia, The Free Encyclopedia. 28 Apr 2008, 06:40 UTC. Wikimedia Foundation, Inc. 28 Apr 2008 <http://en.wikipedia.org/w/index.php?title=Dark_matter&oldid=208702027>.
2. Kakadelis, Stratis. 09 May 2008 <http://hubblesite.org/gallery/album/entire_collection/pr2007017b/>.
"Dark Matter," Microsoft® Encarta® Online Encyclopedia 2007
"Dark Matter: Strong Gravitational Lensing." LSST. 2003. 9 May 2008 <http://search.live.com/images/results.aspx?q=dark+matter&FORM=BIRE&adlt_set=strict#focal=681af07799447559e0b0c176f16d4d36&furl=http%3A%2F%2Fwww.lsst.org%2FScience%2Fimages%2Fmass_recon0024_500.jpg>.
University of Copenhagen. "Dark Matter Of The Universe Has A Long Lifetime." <http://www.sciencedaily.com/releases/2007/10/071001112906.htm> ScienceDaily 4 October 2007. 29 April 2008 .
Jay M. Pasachoff. Science Explorer Astronomy. Boston Massachusetts: Pearson Prentice Hall, 2005. Page 152
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Orginal Author:
| Name (First Name and Last Initial) | Class Period |
| Daniel B. | 5th |
Status:
| Date | Status |
| 5-6-08 | Completed |
KEY:
- Started = This wiki has been started, but is not yet finished. Original Author has 2 weeks to complete or page becomes fair game for someone else to adopt.
- Completed = This wiki is ready to be assessed for a grade.
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Graded = Mrs. Flynt has graded this wiki. Original Author has 2 weeks to improve and then page opens for peer edits.
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Open for Editing = The author has has relinquished control. This page is now open for peer editing and changes to improve its usefulness.
Peer Editing:
| Name (First, Last Init.) | Period | Date | Description of what was changed |
| Derek Hiegel | 5th | 5/19/08 | Put discription under the orange picture |
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