Possible Origins
Complex conditions thought to be required for abiogenesis are not known to exist anywhere within the solar system. However several candidates beyond Sol's habitable zone have been identified that have some of the ingredients thought necessary for life to exist. The alternate theory of panspermia suggests life may have been introduced to such environments.
There is also the theoretical possibility of extraterrestrial biochemistries exotic beyond current human speculation.
Deliberate or accidental future forward-contamination by organisms originating from Earth is a distinct possibility in these potentially habitable environments. Such cases would make it difficult to determine where the origin of life was.
Read more about this topic: Natural Satellite Habitability
Famous quotes containing the word origins:
“Compare the history of the novel to that of rock ‘n’ roll. Both started out a minority taste, became a mass taste, and then splintered into several subgenres. Both have been the typical cultural expressions of classes and epochs. Both started out aggressively fighting for their share of attention, novels attacking the drama, the tract, and the poem, rock attacking jazz and pop and rolling over classical music.”
—W. T. Lhamon, U.S. educator, critic. “Material Differences,” Deliberate Speed: The Origins of a Cultural Style in the American 1950s, Smithsonian (1990)
“Lucretius
Sings his great theory of natural origins and of wise conduct; Plato
smiling carves dreams, bright cells
Of incorruptible wax to hive the Greek honey.”
—Robinson Jeffers (1887–1962)