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".
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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.
Theory that life exists in space and is distributed through the universe in the form of germs and/or spores.

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.