Interplanetary 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.


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    Title :

    Cosmic Collisions and the Longevity of Non-Spacefaring Galactic Civilizations


    Contributors:
    Ostro, S. H. (author) / Sagan, C. (author)

    Publication date :

    1998-05-01


    Type of media :

    Preprint


    Type of material :

    No indication


    Language :

    English





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