In the 21st century, interpretations of extraterrestrial life have expanded beyond 'green Martians' and 'Grays' to include sentient beings that come to Earth to share knowledge.

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 (1)

• extraterrestrial life concept