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Life on Mars - How it disappeared (if it was ever there)Information available on Mars chemistry suggest that conditions on early Mars may have been suitable for life. This paper examines the possible events that led to the disappearance of life, assuming it existed, from the surface of Mars. The sequence of events leading to life extinction on early Mars assumes the following steps: (1) a decrease of temperature and humidity levels, leading to a selection of microorganisms for tolerance of low temperatures and arid conditions; (2) further deterioration of environment leading to withdrawal of cold-adapted organisms to protected niches under the surface; (3) further cooling producing heavy stresses in these organisms; and (4) further deterioration of the environment resulting in extinction. This sequence of events is considered parallel events documented for the microbial community in the Ross Desert of Antarctica, where TEM examinations of the material detected progressive stages of cell damage and death.
Document ID
19890064152
Document Type
Reprint (Version printed in journal)
Authors
Friedmann, E. Imre (Florida State Univ. Tallahassee, FL, United States)
Koriem, Ali M. (Florida State University Tallahassee, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1989
Publication Information
Publication: Planetary Biology and Origins of Life, 20th, 21st, and 23rd, Espoo, Finland, July 18-29, 1988) Advances in Space Research
ISSN: 0273-1177
Subject Category
SPACE BIOLOGY
Funding Number(s)
CONTRACT_GRANT: NSF DPP-83-14180
CONTRACT_GRANT: NSG-7337
Distribution Limits
Public
Copyright
Other