A similar hearing last year brought extraordinary moments, including a retired intelligence officer alleging that the U.S. government has recovered nonhuman "biologics" from crash sites.

In the U.S. military's most comprehensive report addressing unconfirmed UFO sightings, defense officials concluded that most sightings dating back to 1945 were of ordinary origin.

NASA is releasing a new report from advisers on what it would take for the agency to study unidentified anomalous phenomena (also known as UFOs) scientifically.

NPR's Scott Simon remarks on the first congressional hearings on UFOs — rebranded now as UAPs (Unexplained Aerial Phenomena) — in 52 years. Sadly, the search for intelligent life continues.