Officials stress that study found no evidence unidentified anomalous phenomena have extraterrestrial origin, but US space agency administrator admits another Earth could exist

Controversial journalist presents purported corpses, claimed to be around 1,000 years old, garnering surprise and ridicule on social media

Former Air Force intelligence officer tells US lawmakers of 'multi-decade' project to reverse engineer extraterrestrial aircraft

Investigators concerned surging number of sightings could be unknown technologies from rival nations

All-domain Anomaly Resolution Office says it has seen uptick in reporting of unidentified objects in the sky; some may have been new technologies flown by Russia, China

Three cavalry scouts tell UK's Daily Mail the eight bright objects they spotted flying over the peninsula were not man-made