A <a href="http://www.nytimes.com/2007/02/06/science/20070206_ORBIT_GRAPHIC.html?_r=2&amp;oref=slogin&amp;oref=slogin" target="_blank">graphical representation</a> of the incredible amount of debris orbiting the Earth. Space junk, including debris from China's recent <a href="http://www.spaceref.com/news/viewnews.html?id=1188">missile test</a> on a weather satellite, may well account for at least some of the <a href="http://www.startribune.com/462/story/981396.html" target="_blank">strange lights</a> (<a href="http://www.chicagotribune.com/news/local/chi-ap-wi-fallingobjects,1,6854064.story?coll=chi-news-hed&amp;ctrack=1&amp;cset=true" target="_blank">and more</a>) seen over the US in recent days. <em>From the <a href="http://www.nytimes.com/2007/02/06/science/20070206_ORBIT_GRAPHIC.html?_r=2&amp;oref=slogin&amp;oref=slogin" target="_blank">NYT</a>.</em>