Losing the Dark | Clipmarks


	Losing the Dark

ruralart

5-4-2008 5:35 PM

353 views

tags:

astronomy, night, dark, sky, lights

ruralart says:

Maps showing the loss of dark over the last 50 years or so.

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/f58067e2-1cc4-4931-9c62-cb7746d18e40/D1AECE81-44F6-4BCD-B78D-96CF476F6DFE/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.yosemite.org/naturenotes/NALightPollution.htm" href="http://www.yosemite.org/naturenotes/NALightPollution.htm" style="font-size: 11px;">www.yosemite.org</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.yosemite.org/naturenotes/NALightPollution.htm"><STRONG>Growth of Light Pollution in North America</STRONG></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.yosemite.org/naturenotes/NALightPollution.htm"><div align="center"><img src="http://content8.clipmarks.com/blog_cache/www.yosemite.org/img/604BC789-033D-45ED-BA6D-A663B61EEBE3" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.yosemite.org/naturenotes/NALightPollution.htm"><FONT size="2" face="Verdana, Arial, Helvetica, sans-serif">The maps
          show artificial night sky brightness and are based on upward light
          measured by the Defense Meteorological Satellite Program after accounting
          for propagation and scattering of that light in the atmosphere. </FONT></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.yosemite.org/naturenotes/NALightPollution.htm"><FONT size="2" face="Verdana, Arial, Helvetica, sans-serif">The night
          sky in all areas here which are not black (but have other colors) is
          considered polluted. Today, two thirds of the USA's population have
          lost naked eye visibility of the Milky Way.</FONT></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.yosemite.org/naturenotes/NALightPollution.htm"><FONT size="2" face="Verdana, Arial, Helvetica, sans-serif">The colors
          indicate the artificial night sky brightness as a fraction of the average
          natural night sky brightness.</FONT></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/D1AECE81-44F6-4BCD-B78D-96CF476F6DFE/blog/" title="blog or email this clip"><img src="http://content9.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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