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8 - Searching for Extraterrestrial Life Without a Definition or Universal Theory of Life

Published online by Cambridge University Press:  05 September 2019

Carol E. Cleland
Affiliation:
University of Colorado Boulder
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Summary

When most people think about extraterrestrial life they envision intelligent, often technologically advanced, humanoid creatures, such as the Prawns (District Nine) and the Na’vi (Avatar), robots, such as Gort (The Day the Earth Stood Still), and the hive-like Borg (Star Trek). Most astrobiologists, however, are not looking for intelligent life. They are looking for bacteria-like organisms. For as discussed in Section 5.2, microbial life is almost certainly far more common in the universe than complex multicellular organisms, let alone intelligent, technologically sophisticated creatures. Because they are so tiny, detecting and identifying extraterrestrial microbes is especially challenging.

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Chapter
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The Quest for a Universal Theory of Life
Searching for Life As We Don't Know It
, pp. 172 - 194
Publisher: Cambridge University Press
Print publication year: 2019

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