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Cosmic Collisions and the Longevity of Non-Spacefaring Galactic CivilizationsInterplanetary collision hazards in many planetary systems force civilizations to become spacefaring or extinct. This selection pressure apparently acts on a timescale of 10(sup 5) years on Earth's current human civilization, but may act on shorter or longer timescales elsewhere.
Document ID
20060041313
Acquisition Source
Jet Propulsion Laboratory
Document Type
Preprint (Draft being sent to journal)
External Source(s)
hdl:2014/19498
Authors
Ostro, S. H.
Sagan, C.
Date Acquired
August 23, 2013
Publication Date
May 1, 1998
Distribution Limits
Public
Copyright
Other
Keywords
Cosmic Collision Spacefaring Galactic Civilization

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