A first-of-its-kind panel organized by NASA opened a study on Monday of what the government calls "unidentified aerial phenomena," commonly termed UFOs, bringing together experts from scientific fields ranging from physics to astrobiology.

The 16-member panel, convened with little fanfare, will focus its inquiry entirely on unclassified sightings and other data collected from civilian government and commercial sectors, according to NASA.

The team's inquiry is separate from a newly formalized Pentagon-based investigation of unidentified aerial phenomena, or UAPs, reported by military aviators and analyzed by U.S. defense and intelligence officials.

The parallel NASA and Pentagon efforts highlight a turning point for the U.S. government after spending decades deflecting, debunking and discrediting observations of unidentified flying objects, or UFOs, dating back to the 1940s.

The term UFOs, long associated with notions of flying saucers and alien spacecraft, has been replaced in official government parlance by "UAP."

Announcing the formation of its panel in June, NASA said: "There is no evidence UAPs are extraterrestrial in origin."

A Pentagon report issued a year earlier likewise found insufficient data to determine the nature of more than 140 credible sightings documented by military observers since 2004, mostly Navy personnel.

Senior defense and intelligence officials testified before Congress five months ago that the list of cataloged UAP sightings had since grown to 400 but many remain beyond explanation, either as advanced earthly technologies, atmospherics or something alien. 

Among them are video released by the Pentagon of enigmatic airborne objects exhibiting speed and maneuverability exceeding known aviation technology and lacking any visible means of propulsion or flight-control surfaces.

NASA said its panel would spend nine months devising its own strategy for how to organize and study sightings before recommending "a roadmap of potential UAP data analysis by the agency going forward." Its first report is to be made public in mid-2023.

"Understanding the data we have surrounding unidentified aerial phenomena is critical to helping us draw scientific conclusions about what's happening in our skies," said Thomas Zurbuchen, associate NASA administrator. "Data is the language of scientists and makes the unexplainable explainable."

The panel is chaired by David Spergel, who formerly headed Prince University's astrophysics department.

Other members include Anamaria Berea, a research affiliate at the SETI (Search for Intelligence Life) Institute in Mountainview, California; retired NASA astronaut and test pilot Scott Kelly; University of Rhode Island biological oceanographer Paula Bontempi; and University of California at San Diego astrophysicist Shelley Wright.