Many people believe that beings from outer space have visited us for centuries. Some say that life on Earth originated "out there" and was seeded here. Others say that aliens have __(13)__ what happens on Earth, and are responsible for quite a few legends, and that the ancient Greek and Roman gods,as well as the fairies and dwarfs in many classical tales, were in fact "space people" living here. Still __(15)__ say that aliens were responsible for the growth of highly evolved civilizations which have __(16)__ perished, including the Incan and Mayan civilizations and the legendary Atlantis. A lot of ancient civilizations, __(17)__ the Egyptians, Hindus, Greeks, and Mayans, have left writings and drawings which indicate contacts with superior beings "from the stars." Many believe that the aliens are here to help us, while others hold that the aliens intend us __(19)_. Still others think that most aliens visit Earth to study us like our scientists study primitive natives and animals, and have no interest in helping us __(20)__. It is difficult to comment conclusively on these theories in general, apart from saying that any and all of them might be possible. Maybe time will tell. *
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