Zaxares wrote...
I'm sure lots of people will think I'm kooky for this, but I believe that aliens have already found us. They're watching and observing, but for whatever reason, have opted not to reveal their presence to us. Perhaps some high-level human individuals or organisations know about their presence, or what they're doing here, but if so, they're not tipping their hand.
Well, I don't personally see any reason to believe this, and good reason to find it improbable to the extreme. There's no good evidence for it (which is the main reason not to believe it), and many factors that make me believe that it is very unlikely that two sentient species would ever meet.
The vast distances between stars, and the inhospitable nature of space, added to the light-speed limit (and a practical limit probably a lot lower than that), is one such factor. Another is the timescales involved - for two intelligent species to have a reasonable chance meet, they would not only have to have evolved in the same, rather small region of the same galaxy, but they would have to exhibit intelligence in the same span of time. And looking at life on Earth - the only example we have of life evolving - I think that enough unlikely contingencies are needed for an intelligent species to emerge to put serious doubt over whether you'd expect intelligent species to be commonplace.
I rather suspect that they are very, very few and far between.
Even making contact with another species is going to be very difficult - if we ever detect a signal that indicates the presense of another intelligent species, I suspect that getting much beyond that confirmation that they exist will be near impossible; depending of course on the distance. If we get REALLY lucky, and find another intelligent civilization, say, 20 light years from us, it'll still take a minimum of 40 years to say "hello", and receive a "hi!" back. That's going to be one sluggish conversation.
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