​Source for much of the information in this presentation and the chart above http://nightsky.jpl.nasa.gov/

Neil deGrasse Tyson discusses alien life - http://www.nasa.gov/vision/universe/starsgalaxies/search_life_I.html​

NASA Information about Astrobiology (alien life) - http://www.nasa.gov/subject/6888/astrobiology/

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​The SETI Institute (Search for Extraterrestrial Intelligence)  - http://www.seti.org/


Use your computer's idle time to search for Alien Intelligence - http://setiathome.ssl.berkeley.edu/

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Aliens