How many habitable planets in the universe?

Details How many habitable planets in the universe? How many habitable planets in the universe?

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aeam...28...34d&link_type=abstract

Aerospace America (ISSN 0740-722X), vol. 28, Jan. 1990, p. 34, 35, 37, 39.

Computer Science

Extrasolar Planets, Habitability, Planetary Evolution, Planetary Geology, Extraterrestrial Life, Planetary Composition, Planetary Systems, Protoplanets, Tectonics, Universe

Scientific paper

An evaluation is made of the role of such greenhouse gases as CO2 in the creation of circumstances habitable to life-forms in planets whose position relative to their star is comparable to that of Venus and Mars to the sun. The possibility of hydrogen depletion is also considered as a major factor in the possibility of approximation to terrestrial circumstances. The size of planets is also noted to play a role, in that larger planets will possess tectonic activity associated with atmosphere- and ocean-enhancing weathering chemistries.

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