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Impacts and the origin of lifeAs living creatures, all of us have some interest in the question of how life originated. To some, the question is more religious than scientific; nonetheless, a small but dedicated group of scientists spend their careers trying to answer it from a rational standpoint. Logically, the question can be broken down into the three standard divisions of any mystery: When did life originate? Where did it originate? And how did it originate? Of these three sub-questions the last is by far the most difficult and I will make no attempt to address it here. I will however take a personal look at the two easier parts of the problem. In particular, I will outline my current view of the physical environment of the early Earth, and I will try to show how observations of other solar system bodies, especially our own Moon, provide clues as to when and where life could have originated.
Document ID
20040090196
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kasting, J. F.
(University Park United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 1990
Publication Information
Publication: Earth and mineral sciences
Volume: 59
Issue: 4
ISSN: 0026-4539
Subject Category
Exobiology
Distribution Limits
Public
Copyright
Other
Keywords
Review
Review, Tutorial
Non-NASA Center
NASA Discipline Number 52-30
NASA Program Exobiology
NASA Discipline Exobiology

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