Let's look at some numbers. The Milky Way Galaxy (our Galaxy) is 100,000 light years across and contains about 100 billion stars. There are about 100 billion galaxies. We have been transmitting electromagnetic energy to space for about 100 years. That means other civilizations within 100 light years may know about us, if they were listening on the correct frequency. Assuming a civilization within 100 light years knows about us, what is probability that they have advanced enough technology to travel here in a reasonable amount of time? What is the probability that if they had sufficient technology to come here that they would? There is no evidence that we have been visited and the extreme distances and large number of possibly habitable planets makes the probability of visitations to our particular planet remote.
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Originally Posted by coconutmama
I have no doubt that we have been & continue to be visited. To think we are the only civilization seems naive to me. It was not that long ago that sound waves were unimaginable. Because we cannot see it does not mean it isn't there.
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