Quote:
Originally Posted by Brian837
Lets say there are 10 other planets out there with life that has super space ship and can fly all over. What are the odds of them finding us? We are on a small planet on a galaxy that is one in over a billion of them. Just finding us in this galaxy that is a million light years across would be amazing but a billion more of them. It just doesn't seem possible
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The odds of us being spotted by someone else in our galaxy are fairly high, because the earth is the "brightest" radio source. If someone somewhere pointed a radio telescope in our direction, and they were less than about 120 light years away, we would blind them with non-natural radio waves.
The same would be true if we were looking for them.Even if there were advanced cilivilsations out there, we just could not see them unless they had been producing radio waves, or artificial light, or other forms of electromagnetic energy for a very long time. The greater the distance, the longer they must have been doing this.