From "Cosmos" by Karl Sagan

  "Would a society a million years in advance of us be interested 
   in colonization or interstellar spaceflight?" - p. 341

  "Might a civilization composed of essentially immortal beings
   consider interstellar exploration fundamentally childish?
   It may be that we have not been visited because the stars are
   strewn abundantly in the expanse of space, so that before a
   nearby civilization arrives, it has altered its exploratory 
   motivations or evolved into forms indetectable to us." 
   ...

   "In fact, there is almost no chance that two galactic
    civilizations will interact at the same level. ... A million
    years is a great many." p. 342



   "Cosmos - the story of cosmic evolution, science and civilization"
    by Karl Sagan.


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              FURTHER REFERENCES

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