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If indeed, someone has managed to cross the light barrier, and thus is capable of visiting the Earth...somehow I doubt we would be able to do anything about an attack as the advanced nature of such an entity would likely be far beyond any defences we might put up. Also, the chances of such an advanced civilization flying around with flashing lights are pretty freakin' slim, If they are here and don't want to be seen....you simply wont see them.
Personally, given the advances we have made in Nanotech... I also find it very unlikely someone would send a big ass flying saucer down here, when a probe the size of a fly would be sufficient. Are there Aliens?...extremely likely. Are they flying around letting us make bad movies of them?...Doubtful at best. Chances are they would have no Idea we are even here yet, as most of our transmissions have barely reached the nearest stars even if they do decide to listen to the radio.
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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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