The document discusses the negative impacts of light pollution such as disrupted sleep, effects on nocturnal animals, and potential health risks like increased cancer growth. It provides examples of light pollution in cities compared to rural areas and images showing the night sky before and after limiting outdoor lighting. Solutions to light pollution mentioned include using directed lighting to minimize stray light and annual events where communities turn off non-essential lighting for a period of time.

1. Light Pollution Hyun Ji Y. Kelsey D. Maddy U.

2. Country and City picture found at: <http://en.wikipedia.org/wiki/File:Light_pollution_country_versus_city.png>.

3. the entire world picture found at: http://en.wikipedia.org/wiki/File:Earthlights_dmsp.jpg

4. As well as the Universe picture found at: http://www.universetoday.com/30168/galaxies/

5. wasteful excessive obstructive picture found at: http://commons.wikimedia.org/wiki/File:Lightmatter_la_at_night_001.jpg.

6. &quot;The importance of sleep cannot be overestimated in the maintenance of a healthy body .&quot; -Harvard Women's Health Watch Picture found at : http://www.flickr.com/photos/kris10lprs/3001891736/

7. Nocturnal Animals picture found at: http://www.flickr.com/photos/mskelton51/3816540350/

8. &quot; Human light spills into the natural world, some aspect of life —migration, reproduction, feeding— is affected .&quot; -National Geographic Picture found at: http://ngm.nationalgeographic.com/2008/11/light-pollution/klinkenborg-text

9. Depression picture found at: http://www.topnews.in/health/mice-study-finds-link-between-depression-and-inflammatory-response-29828

10. &quot;People who are working while others are stargazing may face the greatest risks . Hormonal disturbances triggered by nighttime exposure to white or bluish light can disrupt circadian rhythms and fuel the growth of tumors , experiments show.&quot; -Ben Hader, US News Science picture found at: http://www.usnews.com/usnews/photography/light_pollution/bigpicture.php?image=7&s_cid=7

11. Before After For an hour on March 31, 2007, people in Sydney, Australia, turned off many of their lights. pictures found at: http://www.usnews.com/usnews/photography/light_pollution/bigpicture.php?image=3&s_cid=3 , http://www.usnews.com/usnews/photography/light_pollution/bigpicture.php?image=4&s_cid=4

12. And Solutions... pictures found at: http://en.wikipedia.org/wiki/File:Earth-Hour-Logo.jpg, http://science.howstuffworks.com/environmental/green-science/light-pollution3.htm

13. Works Cited Astronomers and amateur stargazers need dark skies to see the heavens. Digital image. U.S. News & World Report. Web. 21 Nov. 2011. http://www.usnews.com/usnews/photography/light_pollution/bigpicture.php?image=7&s_cid=7. Cain, Fraser. Spiral Galaxy NGC 3982. Digital image. Universe Today. 30 Apr. 2009. Web. 21 Nov. 2011. <http://www.universetoday.com/30168/galaxies/>. Christopher Backing. &quot;Light At Night Is Dangerous To Health.&quot; Medical News Today. MediLexicon, Intl., 29 Jan. 2007. Web. 17 Nov. 2011. Earth Hour Logo. Digital image. Wikimedia Commons. Wikipedia, 11 Mar. 2008. Web. 21 Nov. 2011. http://en.wikipedia.org/wiki/File:Earth-Hour-Logo.jpg. Harder, Ben. &quot;Light Pollution: Night Skies, Dark No More - US News and World Report.&quot; US News & World Report | News & Rankings | Best Colleges, Best Hospitals, and More. National Science Foundation, 14 Mar. 2008. Web. 21 Nov. 2011. &quot;Light Pollution - The Solution.&quot; Astronomical Society of South Australia. Astronomical Society of South Australia. Web. 21 Nov. 2011. Locher, John. Light fixtures like this one focus the light where it's needed. Digital image.How Stuff Works. Web. 21 Nov. 2011. <http://science.howstuffworks.com/environmental/green-science/light-pollution3.htm>. Logan, Aaron. Lightmatter LA at Night. Digital image. Wikimedia Commons. Wikipedia. Web. 19 Nov. 2011. <http://commons.wikimedia.org/wiki/File:Lightmatter_la_at_night_001.jpg>. Mayhew, Craig, and Robert Simmon. Earthlights. Digital image. Wikipedia. 23 Oct. 2000. Web. 19 Nov. 2011. <http://en.wikipedia.org/wiki/File:Earthlights_dmsp.jpg>. Richardson, Jim. Our Vanishing Night. Digital image. National Geographic. National Geographic Society, Nov. 2008. Web. 21 Nov. 2011. <http://ngm.nationalgeographic.com/2008/11/light-pollution/klinkenborg-text>. Skelton, Michael. Great Horned Owl. Digital Image. Flickr. Yahoo, 12 Aug. 2009. Web. 19 Nov. 2011. <http://www.flickr.com/photos/mskelton51/3816540350/>.

14. Works Cited (cont.) Society for Neuroscience. &quot;Disruption Of Circadian Rhythms Affects Both Brain And Body, Mouse Study Finds.&quot;ScienceDaily, 26 Oct. 2009. Web. 17 Nov. 2011. Stanley, Jeremy. Light Pollution Country Versus City. Digital image. Wikipedia. 6 Aug. 2007. Web. 19 Nov. 2011. http://en.wikipedia.org/wiki/File:Light_pollution_country_versus_city.png . Sweet Silence. Digital image. Flickr. Yahoo, 19 Oct. 2008. Web. 18 Nov. 2011. http://www.flickr.com/photos/kris10lprs/3001891736/ &quot;The Fading Milky Way.&quot; NASA Science. NASA, 1 Nov. 2001. Web. 21 Nov. 2011. Toothman, Jessika. &quot;HowStuffWorks &quot;The Solution to Light Pollution&quot;&quot; HowStuffWorks &quot;Science&quot; 31 Aug. 2009. Web. 21 Nov. 2011. Turner, Grant. And after the city plunged into darkness. Digital image. U.S. News & World Report. Web. 21 Nov. 2011. http://www.usnews.com/usnews/photography/light_pollution/bigpicture.php?image=4&s_cid=4 . Turner, Grant. People in Sydney, Australia, turned off many lights for an hour on March 31, 2007. Here's the Sydney skyline before. Digital image. U.S. News & World Report. Web. 21 Nov. 2011. http://www.usnews.com.