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This months Wired magazine has a great article on tracking satellites. Well, the article is not that great, but the website they give is pretty darn good: http://www.heavens-above.com
Check it out for satellite tracks and other astronomy goodies.
A blog for topics in science, engineering, math, and physics. I seek to comment and reference events, sites, and articles that are of interest to people of varied backgrounds.
Quoting from the site:
"On December 15, 2005, Dr. Curtis Cooper and Dr. Steven Boone, professors at Central Missouri State University, discovered the 43rd Mersenne Prime, 230,402,457-1.
The discovery is the largest known prime number.
The new prime is 9,152,052 digits long. "