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While I, personally believe there are many civilizations "out there", I am forced to consider two very important factors.
1) Distances- Considering the closest candidate for a civilization is a minimum of 4 light years away, and the furthest possible known candidate is a little over 14 billion light years away...The Odds of a meeting of any two civilizations become slim, even with cheap interstellar travel.
2) Timing- Our species is a couple hundred thousand years old. Our civilization is a couple thousand years old. Our technological revolution in a couple hundred years old. Our planet is 4 billion years old. When taken in the context of Matched timing likelyhood, its extremely unlikely any two civilizations just happen to be at the same stage of evolution, let alone capable of noticing the other even exists.
Now, considering the distances between any two peoples, combined with the Chance they just happen to see one another....what would you all place the odds at?
Also....think about this. 100 yrs. from now some creature on another planet picks up I love Lucy on his ultra powerful TV reciever. He then decides to send a little something back to say hello. Do you really think we will even be listening to that old Radio technology in 200 yrs? Hell very soon we stop all analog broadcast in the US anyway.
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Holding onto anger is like grasping a hot coal with the intent of throwing it at someone else; you are the one who gets burned. - Buddha
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