Carl Sagan argued that statistically, aliens likely visit Earth every few hundred thousand years, treating the planet as a way station rather than a place of specific interest.

Authors

• Person: Not available Organization: WBUR
  UFOs and the U.S. government: The push towards greater ... - WBUR

Sources

• UFOs and the U.S. government: The push towards greater ... - WBUR www.wbur.org WBUR via serper

Referenced by nodes (1)

• Carl Sagan entity