Have extra-terrestrials visited earth? Were they the cause of religion? (Just too add ideas, not a REAL question!)

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It seems that with the constant discovery of planets in other solar systems and some with the potential to be "Earth-like", why couldn't life have evolved elsewhere in the universe? However, any life that may exist doesn't have to follow the same rules or be a carbon based life form. Therefore, we might not even know what to look for. I think mathematically that it makes sense based on the sheer number of stars and planets that revolve around them, that there must be life elsewhere although at this point, we have no definite proof.

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It seems pretty small-minded to believe that humans are the only intelligent beings in our universe, and it would not surprise me to find that other forms have visited Earth in the past. Officially, no government has ever acknowledged the possibility, and since most governments routinely lie to the populace, we may never know the truth about extraterrestial contact.

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In response to #7 - the people who believe that similarities in ancient construction indicate extraterrestrial visitation need to take some classes in anthropology. Humans have moved across the globe in several waves of migration, and they took their ideas and culture with them. There is no reason to think that the fact that pyramids (which are very different in both structure and purpose, by the way) exist in both Central America and Egypt is proof of anything other than that those societies that had enough disposable income to build impressive edifices.

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There are a lot of people who really beleive that the gods of our ancestors were aliens. They point out that many ancient civilizations seem to have built similar structures, such as pyramids. They suggest that aliens must have visited and wanted pyramids for some reason. I don't think we will ever really know, unless the aliens come again.
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I would be stunned if I discovered that there was not life somewhere else in the universe, especially given the increasingly rapid discovery of other planets and solar systems over the last decade or so. However, there is no evidence that extra-terrestrials have visited Earth. If they had, their civilization would have needed quite a head start to develop the kind of technology that would allow them to do so. It makes for interesting speculation, and there's nothing inherently wrong with that, but that's all it is. 

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If they have, we don't have any evidence of it.  It seems really unlikely that aliens could have visited Earth without there being any evidence of it.  I know that von Daniken and people like that claim that there is evidence, but it seems really unlikely that things like the Nazca Lines are really alien landing fields or navigation devices or anything like that.

I agree that it's likely that there is life somewhere other than Earth, but I don't think there's any evidence that they've been here.

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I don't know if extra-terrestrials have ever visited Earth or not, but I do have a few views on the subject that I think are interesting to think about.  For example, consider the scope of the universe.  Few of us have the mental capability to realize just how big our universe actually is.  I have a model of just our solar system, the sun, the Earth, and the other planets, called the "1000 Yard Solar System".  When you set this model up, our solar system stretches over 1000 yards.  The sun is the size of a soccer ball, Mercury is the size of a pinhead, Venus and Earth are peppercorn sized, and the distance from the Earth to our moon is 2.25 inches.  2.25 inches!!!  That represents how far man has been off the planet.  Can you imagine trying to go to one of the planets like Uranus or Neptune with our current space technology?  It would take decades just to make the trip!

So if I were God, and I had this really big room to set up all these planets, galaxies, and solar systems in, that were separated by this huge expanse of space, why would I stop with just one planet with one type of species called humans?  Maybe their are other species with advanced scientific advances that dwarf ours, and they are much too sophisticated for us to detect them, much less go visit them.  It certainly provides food for thought.

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