[CaptainCrunch]

I completely believe that there are other civilizations out there, however I think its a completely other different argument that they've been here.

I believe that the fact that we've never seen visible proof of aliens in our neighborhood and the length of time that it would take to even travel between systems at the speed of light makes it unlikely that visitors have been here.

The vast amount of stars (billions) in the universe tells me that its unlikely that they would have even seen evidence that there is life here, combine that with the probable differences in technology, language, math and perception means that the radio waves and television waves that have left this planet would not be interesting and more then likely sound like random background space noise to them.

The obvious differences in terms of evolution and basic components of life would possibly mean that they could see life here and not even perceive it as life let alone intelligent life.

Even if they had sent a unmanned probe here it would take several thousand years for telemetry to get back to them, therefore the most likely is that the signals that are getting to them would show random stupid microbes or dinosaurs or even early mammels stupidly roaming the planet.

To me its equivalent to me throwing millions of marbles onto an area the size of Calgary and trying to find the one marble with a micro organism on it, its an impossible task to find that one marble with even the possibility of life on it, and once finding it having to crawl to it traveling at one foot per 100 years.