The scientific search for life outside the earth. Sites containing material which cannot be scientifically explained, such as ufology, are listed within the category "Society: Paranormal".
Exobiology
Exobiology (also called Astrobiology or Xenobiology) is a branch of biology investigating the possibility of extraterrestrial life and studying the possible effects of extraterrestrial environments on life.
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Panspermia
Theory that life exists in space and is distributed through the universe in the form of germs and/or spores.
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SETI
The Search for Extraterrestrial Intelligence. Institutes and programs for scientific and educational projects relevant to the nature, distribution, and prevalence of life in the universe.
Optical,
SETI at Home,
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