An expert on UFOs said while there's no concrete evidence to show whether aliens may or may not be out there, there are technological artifacts that exist "way beyond our comprehension."
In May, a former US Navy pilot told CBS's 60 Minutes that pilots training off the US coast sighted UFOs - also known as Unidentified Aerial Phenomena (UAP) - nearly every day.
In 2019, the Department of Defense launched a special task force to investigate videos of UAP. A report on the sightings found no evidence that UAP sighted belong to aliens, but said so little is known that it can't be ruled out.
University of Southern California Professor Madhu Thangavelu told Insider that what pilots saw may not be extraterrestrial in origin, as there still isn't any public evidence that aliens exist – but that doesn't mean the possibility is off the table.
"[In the] scientific field, the material evidence is important," he said.
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