Carl Sagan explains why aliens are not visiting us all the time

Excerpt from 1966 CBS interview with Carl Sagan. The man with him is Dr. Thornton Page, professor of astronomy at the University of Chicago and who served on a CIA-sponsored committee of scientists in 1953 studying the available evidence of UFOs.

https://en.m.wikipedia.org/wiki/Thornton_Leigh_Page

from the 1966 CBS documentary "UFO: Friend, Foe, or Fantasy"

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