UFO Timeline
- Mark Dworkin
- Sep 1, 2024
- 4 min read

UFO Timeline
1947 - 1969: Project Blue Book
Over the course of two decades, the U.S. Air Force cataloged 12,618 sightings of UFOs as part of what is now known as Project Blue Book. These sightings included light, objects, and unexplained radar readings reported by military and civilian pilots, weather observers, astronomers and other sources.
The project came to an end in 1969 after a study by the University of Colorado concluded there was no evidence that UFOs came from other worlds, and that most sightings could be explained by natural phenomena or even hoaxes.
“Our general conclusion is that nothing has come from the study of UFOs in the past 21 years that has added to scientific knowledge,” said the study leader, Edward U. Condon. “Further investigation cannot be justified.”
Still, rumors and sightings persisted-sometimes to the annoyance of the original investigators. The Air Force announced in a 1985 fact sheet that “there are not now nor ever have been any extraterrestrial visitors or equipment on Wright=Patterson Air Force Base,” which is where the investigation was headquartered.
1995: A U.S. Senator takes interest
The Condon Report did not put an end to interest in UFOs. So-called “UFOlogists” spent the next few decades filing open records requests with federal agencies to uncover what was known about the sightings.
In 1995, businessman Rober Bigelow convened a small group in Las Vegas to discuss the possibility of alien life. He called the group National Institute for Discovery Science. Participants included two former astronauts, Ed Mitcheel and Harrison Schmitt, and one sitting U.S. Senator, Harry Reid, Democrat of Nevada.
“A lot of people said it would ruin my career,” Reid later said. “That didn’t quite happen.”
Reid, who served in the Senate for 30 years and was the Senate Majority Leader, would eventually become a key figure in driving the U.S. government’s investigation of UFOs.
2004: An encounter off San Diego
In November 2004, two Navy pilots on a training mission were ordered to intercept a mysterious craft. They saw - and captured on video - an unusual oval-shaped craft, about 40 feet long, hovering over the Pacific Ocean about a hundred miles off San Diego. It streaked away before the pilots could get near. “I have no idea what I saw,” said one of the pilots, Comdr. David Fravor, at the time. “It had no plumes, wings or rotors and outran our F-18s.”
2007: A new Pentagon investigation
With backing from Sem. Reid - now the U.S. Senate’s Majority Leader - the Pentagon launched the Advanced Aerospace Threat Identification Program to investigate the latest round of sightings.
“What was considered science fiction is now science fact,” the agency said in briefing papers. The program was run by a military intelligence official, Luis Elizondo, and worked hand-in-hand with an aerospace research company run by Robert Bigelow.
2014: A near-collision on the East Coast
In a series of incidents during this time, Navy pilots reported - and made video recordings - of a series of encounters with unidentified craft near Florida and Virginia that could reach high altitudes and hypersonic speeds. One pilot reported a near-collision in 2014. Another later told 60 minutes that the craft were hard to explain. “You have rotation, you have high altitudes. You have propulsion, right? I don’t know what it is frankly.”
2017: Going public
All such incidents and investigations mostly went unreported to the broader public - until December 2017, when the New York Times reported the existence of the Pentagon’s Advanced Aerospace Threat Identification Program. Although Pentagon officials said the program ended in 2012, Elizondo told the paper he continued its work informally with cooperation from the Navy and CIA until his resignation in the fall of 2017.
That sparked a new wave of interest in UFOs among the public, the media, and even scientists.
2020: A scientific call to action
In July 2020, Ravi Kopparapu and Jocob Haqq-Misra - a NASA scientist and astrobiologist, respectively - wrote in Scientific American that it was time to revisit the conclusions of the Condon report. “Perhaps some, or even most, UAP events are simply classified military aircraft, or strange weather formations, or other misidentified mundane phenomena,” they wrote. “However, there are still a number of truly puzzling cases that might be worth investigating.”
In April 2020, the Pentagon announced the Unidentified Aerial Phenomena Task Force to “improve its understanding of, and gain insight into, the nature and origins” of the unidentified objects.
2021: DNI report
In April 2021, the Navy confirmed video of unidentified objects “buzzing” U.S. warships near California. The incident would be added to the list of sightings under investigation.
In June, the Office of the Director of National Intelligence (DNI) released its preliminary assessment of UFO sightings from 2004 to2021. The report suggested that UFOs - now known as UAPs - could fall into five likely categories: airborne clutter, natural atmospheric phenomena, public and private aerospace developmental programs, foreign adversary systems, “and a catchall ‘other’ bin.” More funding ad reporting was needed, the report said.
2022: NASA jumps in to investigate
In April 2022, the Pentagon announced the formation of the All-domain Anomaly Resolution Office to investigate objects “that might pose a threat to national security.”
The following June, NASA announced it was setting up an independent study program to cover the issue from a scientific perspective.
“We will be identifying what data - from civilians, government, nonprofits, companies - exists, what else we should try to collect, and how to best analyze it,” said David Spergel, the study team leader.
And 2022 also brought another acronym change: “Unidentified Aerial Phenomena” are now officially called “Unidentified Anomalous Phenomena.”
2023: The truth is still out there
Whatever is happening up above, it still hasn’t entirely been explained. The DNI released a follow-up report in June 2023, identifying an additional 510 sightings - of which 171 remained unexplained. In those cases, unidentified craft often “appear to have demonstrated unusual flight characteristics or performance capabilities,” the report stated.