A search for life on Earth from the Galileo spacecraft

Details A search for life on Earth from the Galileo spacecraft A search for life on Earth from the Galileo spacecraft

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993natur.365..715s&link_type=abstract

Nature, Volume 365, Issue 6448, pp. 715-721 (1993).

Physics

69

Scientific paper

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 search for extraterrestrial life by modern interplanetary spacecraft.

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