Next Article in Journal
Previous Article in Journal
Life 2012, 2(3), 255-273; doi:10.3390/life2030255
Article

Venus-Earth-Mars: Comparative Climatology and the Search for Life in the Solar System

Received: 8 August 2012; in revised form: 31 August 2012 / Accepted: 7 September 2012 / Published: 19 September 2012
View Full-Text   |   Download PDF [597 KB, uploaded 19 September 2012]   |   Browse Figures
Abstract: Both Venus and Mars have captured the human imagination during the twentieth century as possible abodes of life. Venus had long enchanted humans—all the more so after astronomers realized it was shrouded in a mysterious cloak of clouds permanently hiding the surface from view. It was also the closest planet to Earth, with nearly the same size and surface gravity. These attributes brought myriad speculations about the nature of Venus, its climate, and the possibility of life existing there in some form. Mars also harbored interest as a place where life had or might still exist. Seasonal changes on Mars were interpreted as due to the possible spread and retreat of ice caps and lichen-like vegetation. A core element of this belief rested with the climatology of these two planets, as observed by astronomers, but these ideas were significantly altered, if not dashed during the space age. Missions to Venus and Mars revealed strikingly different worlds. The high temperatures and pressures found on Venus supported a “runaway greenhouse theory,” and Mars harbored an apparently lifeless landscape similar to the surface of the Moon. While hopes for Venus as an abode of life ended, the search for evidence of past life on Mars, possibly microbial, remains a central theme in space exploration. This survey explores the evolution of thinking about the climates of Venus and Mars as life-support systems, in comparison to Earth.
Keywords: Venus; Mars; Earth; space exploration; astrobiology; Percival Lowell; NASA; Carl Sagan; Percival Lowell; James C. Fletcher Venus; Mars; Earth; space exploration; astrobiology; Percival Lowell; NASA; Carl Sagan; Percival Lowell; James C. Fletcher
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Export to BibTeX |
EndNote


MDPI and ACS Style

Launius, R.D. Venus-Earth-Mars: Comparative Climatology and the Search for Life in the Solar System. Life 2012, 2, 255-273.

AMA Style

Launius RD. Venus-Earth-Mars: Comparative Climatology and the Search for Life in the Solar System. Life. 2012; 2(3):255-273.

Chicago/Turabian Style

Launius, Roger D. 2012. "Venus-Earth-Mars: Comparative Climatology and the Search for Life in the Solar System." Life 2, no. 3: 255-273.



Life EISSN 2075-1729 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert