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Originally Posted by rogerbo
Who are we that we should be the only ones in the Universe ??
It may bee that there are no UFO's realy seen on this Planet, but the whole Univers is soooooo Big and in many parts Older the the Earth itself and if the Theory that life came to earth by comets and meteors is right the to asume that Humans are the only inteligent Race in the Univers is just ignorant.
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I agree, but that in no way argues for the existence of aliens who have visited Earth.
The fact is, the distance between us and our nearest interstellar neighbour is HUGE. A spacecraft travelling at the highest speeds we've been able to achieve in space would take over 50,000 years to reach Alpha Centauri. While I'm pretty sure aliens exist, the big question is whether they can get off their planet before the civilization is destroyed by an asteroid impact or other natural catastrophe. If they can, the odds are that they won't be able to get settled on a planet outside their solar system because the chances of finding a suitable planet and being able to reach it are very small indeed. The other thing is that any civilizations in the universe will tend to inhabit areas far away from a galactic hub, because when you place stars closer together it becomes less and less likely for any civilization to last long before some catastrophe destroys it. So the civilizations that may exist probably exist quite far from their neighbouring stars.