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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    Titel :

    Cosmic Collisions and the Longevity of Non-Spacefaring Galactic Civilizations


    Beteiligte:
    Ostro, S. H. (Autor:in) / Sagan, C. (Autor:in)

    Erscheinungsdatum :

    1998-05-01


    Medientyp :

    Preprint


    Format :

    Keine Angabe


    Sprache :

    Englisch





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