Nasa promises transparency as it steps up UFO research
Nasa officials have been speaking about a newly-published, lengthy study into hundreds of reports of UFOs - or UAPs, as it calls them
It says most UFO sightings have been explained, but there are a few that are not "known human-made or natural phenomena"
Nasa says there is no reason to conclude that extra-terrestrial sources are behind the UAPs, but it also cannot rule out that possibility
The organisation says it wants to create a "roadmap" for future study and wants to move from "sensationalism to science" - which has pledged to do transparently
The report details how artificial intelligence could be used to investigate future sightings
It says it's important for national security and air safety - 16 of the world's leading data and AI scientists have worked on the study