The Prevalence of Earthlike Planets: Although a rough estimate can be made of how many Earthlike planets might exist in the universe, the possibility that life has actually evolved on them cannot be calculated even in principle

Autor:	Pollard, William G.
Zdroj:	American Scientist, 1979 Nov 01. 67(6), 653-659.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/27849530 Zobrazit plný text záznamu