if you're still on the fence about "other intelligent life", I think that question can be put to bed.
check out myunhauzen74's youtube channel. These guys take the daily feed from the NASA solar satellites and highlight all of the entities that visit the sun that day. Most of these 'crafts' (or whatever they are) are much, much larger than earth. They CAN'T come here. They are bigger than our planet.
it would be like trying to park your car on a piece of gravel - the whole car.
here's the activity from yesterday: http://www.youtube.com/watch?v=I5epVAtSBk0
my guess - been going on since the dawn of time.
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