The appearance of 'Greys' as a specific type of extraterrestrial was solidified and popularized in 1977 by Steven Spielberg's film 'Close Encounters of the Third Kind' and again in 1988 by the cover art of Whitley Strieber's book 'Communion'.

Authors

• Person: Not available Organization: PBS
  Alien Abduction and UFOs: Why Are Grays So Common? | Season 4

Sources

• Alien Abduction and UFOs: Why Are Grays So Common? | Season 4 www.pbs.org PBS via serper

Referenced by nodes (5)

• Grey Aliens concept
• Whitley Strieber entity
• Communion concept
• Close Encounters of the Third Kind concept
• Steven Spielberg entity