Carl Sagan explains why aliens are not visiting us all the time
https://www-newz.blogspot.com/2014/07/carl-sagan-explains-why-aliens-are-not.html
If all the reports of UFO sightings are real, then Earth must be the most popular destination in the Universe. Obviously, that's a ridiculous anthropocentric notion, as Dr. Carl Sagan explains in the must-see 1966 CBS documentary UFO: Friend, Foe, or Fantasy hosted by Walter Cronkite. Listen to Sagan at the 51:55 mark.
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