The US has now collected 510 reports of unidentified flying objects, many of which are flying in sensitive military airspace, the Government said in a declassified report summary.
The report said that while there's no evidence of extraterrestrials, they still pose a threat.
Last year the Pentagon opened an office, the All-domain Anomaly Resolution Office, solely focused on receiving and analysing all of those reports of unidentified phenomena, many of which have been reported by military pilots.
