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A search for life on earth at 100 meter resolution. (1971)

Wallace, D. ; Sagan, C.

In: Other Sources

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Publication Date: 2019-06-27

Description: Study of several thousand photos indicating that about 0.01 of Gemini and Apollo photographs of the earth at 100 m resolution reveal signs of life - rectangular arrays due to human agricultural and urban territoriality, roads, canals, jet contrails, and industrial pollution. Potential false positives - e.g., dunes, sand bars, jetstream clouds - abound. A curve is derived for the detectivity of contemporary life on earth, in a plot of ground resolution versus global coverage. A comparable biology on Mars would not have been detected by all observations of Mars through Mariner 7.

Keywords: GEOPHYSICS

Type: Icarus; 15; Dec. 197

Format: text

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