| Literature DB >> 11536539 |
C Sagan1, W R Thompson, R Carlson, D Gurnett, C Hord.
Abstract
In its December 1990 fly-by of Earth, the Galileo spacecraft found evidence of abundant gaseous oxygen, a widely distributed surface pigment with a sharp absorption edge in the red part of the visible spectrum, and atmospheric methane in extreme thermodynamic disequilibrium; together, these are strongly suggestive of life on Earth. Moreover, the presence of narrow-band, pulsed, amplitude-modulated radio transmission seems uniquely attributable to intelligence. These observations constitute a control experiment for the serach for extraterrestrial life by modern interplanetary spacecraft.Entities:
Keywords: NASA Discipline Exobiology; Non-NASA Center
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Year: 1993 PMID： 11536539 DOI： 10.1038/365715a0
Source DB: PubMed Journal: Nature ISSN： 0028-0836 Impact factor: 49.962