U.S. Navy pilots observed unidentified objects at various altitudes, including sea level, and tracked them accelerating to hypersonic speeds, defined as greater than five times the speed of sound.

Authors

• Person: Not available Organization: National Geographic
  How the Pentagon learned to start worrying and investigate UFOs

Sources

• How the Pentagon learned to start worrying and investigate UFOs www.nationalgeographic.com National Geographic via serper

Referenced by nodes (2)

• unidentified anomalous phenomenon concept
• United States Navy entity