Robert Maxwell wrote:
Mr. Laser Beam wrote:
^ But like I said, why would aliens WANT to come to Earth? Any alien species that has the technology to even reach Earth in the first place is probably not going to consider us worth the trip. We would be the equivalent of trailer-park trash to them. So why would they bother?
Where did I ever
say they needed to come to Earth? We have a lot
of telescopes pointed at the sky, which are getting more powerful all the time, and we've never seen even one tiny shred of evidence for intelligent life outside Earth.
If there is intelligent life out there, there is some reason we haven't found it: it's too far away (meaning it is relatively rare), it is not capable of interstellar flight (which means it is difficult enough that hardly anyone can do it), or it simply never exists contemporaneously with us (again, pointing to the rarity or at least short-lived nature of such civilizations.)
How would telescopes help in finding evidence of extra solar civilizations? By detecting interstellar ships in transit? Even if their ships were the size of sodding Jupiter, and were flying through the Proxima Centauri system we wouldn't be able to detect them.
Radio telescopes are probably a better bet, but you have to be pointing them in exactly the right direction, at exactly the right time and happen to be monitoring exactly the right frequency. And the thing about space (altogether now!) space, is big. Really big. You just won't believe how vastly, hugely, mindbogglingly big it is. I mean, you may think it's a long way down the road to the chemist's, but that's just peanuts to space, listen...
I know that it's a bit of an 'invisible dragon' argument, but realistically speaking: saying there's nothing out there because we haven't found any evidence rather fails to take into account our almost total inability to detect anything smaller than a star until it's right on top of us.
I do agree however that while the odds are pretty good that we weren't the first forms of life to achieve some form technological civilization (maybe not even the first on this planet) nor will we be the last, the odds are about as good that no two are ever likely to detect one another given the vast distances and stretches of time involved.
For all we know there could have been a spacefaring race not 100 lightyears from here (so close on the cosmic scale as to practically occupying the same point in space) but we'll never know because they got hit by an comet and wiped out 200 years ago.
I think there's only two or three ways we're likely to get 100% solid proof of an alien civilization: Either one of us randomly stumbles on the other (or our respective ruins/space junk) or by some utter fluke SETI actually picks up the alien equivalent of Jazz FM.
But still, like I said, for all we know we *could* be in the more densely populated star cluster, of the most densely populated spiral arm of the most densely populated galaxy in the universe and there'd be no way we'd even know.Claiming otherwise would be like standing atop your horse drawn cart the the middle of the sahara, peering at the horizon and proclaiming that since there's no evidence of them, Eskimos can't possibly be out there.