Introduction Mankind has always wondered, "Are we alone in the Universe? Isn't there life out there somewhere?" With an estimate around 300 billion stars in the Milky Way galaxy alone, many with their own satellites, the possibilities seem likely that some form of life should exist somewhere in the Universe. This search for life begins with a definition of life itself, followed by possible candidates both within and outside our solar system, and also includes what …showed first 75 words of 2896 total…

…showed last 75 words of 2896 total…May 5, 2006, from http://library.thinkquest.org/26490/Earth.html UCBerkeley News (2003, July 21). Stars rich in heavy metals tend to harbor planets, astronomers report. Retrieved April 28, 2006, from http://www.berkeley.edu/news/media/releases/2003/07/21stars.shtml Wikipedia, the free encyclopedia (2006). Extraterrestrial life. Retrieved May 5, 2006, from http://en.wikipedia.org/wiki/Extraterrestrial_life http://www.planetary.org/explore/topics/seti/ Retrieved May 3, 2006 http://en.wikipedia.org/wiki/Extraterrestrial Retrieved May 3, 2006 http://en.wikipedia.org/wiki/Life Retrieved May 6, 2006.