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Colliding galaxies shed light on dark matter
Astronomers have captured images of a powerful collision of galaxy clusters and say it may shed light on the behavior of dark matter.
http://news.yahoo.com/s/nm/20080827/sc_n...
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Galaxy Surprise Sheds Light on Dark Matter
A study of small galaxies circling around the Milky Way founnd that while they range dramatically in brightness, they all surprisingly pack about the same mass. The work suggests there is a minimum size for galaxies, and it could shed light on mysterious dark matter.
http://news.yahoo.com/s/space/20080827/s...
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Light - Wikipedia, the free encyclopedia
For other uses, see Light (disambiguation) ... In optics, the term "visible light" refers to electromagnetic radiation with ... Light can exhibit properties of ...
http://en.wikipedia.org/wiki/Light
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How Light Works - HowStuffWorks
Presents different ways of thinking about light, addresses what it actually is, how colors are made, and other aspects of the phenomenon.
http://www.howstuffworks.com/light.htm
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Light!
Light!, a site about the physics of light. Created for ThinkQuest '99, this site gives an in depth look at the different aspects of light.
http://library.thinkquest.org/28160/engl...
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The Science of Light
The Science of Light provides hands-on activities for teachers and their students who are exploring light, color, reflection, refraction, etc.
http://www.learner.org/teacherslab/scien...
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Photon - Wikipedia, the free encyclopedia
where h is Planck's constant, c is the speed of light, and λ is its wavelength. ... For visible light the energy carried by a single photon is around 4×10–19 joules; ...
http://en.wikipedia.org/wiki/Photon
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light: Definition, Synonyms from Answers.com
light n. Physics. Electromagnetic radiation that has a wavelength in the range from about 4,000 (violet) to about 7,700 (red) angstroms and may be
http://www.answers.com/topic/light
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