Carl Sagan, a prominent 20th-century astronomer and proponent of the search for extraterrestrial intelligence, was a major skeptic regarding the theory that UFOs are alien visitors to Earth.

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 (3)

• Carl Sagan entity
• Search for Extraterrestrial Intelligence concept
• alien visitation concept