Let's be clear: "U.F.O." is an acronym for "unidentified flying object." It doesn't necessarily mean aliens .
But it also might mean aliens Sorry, Miriam .
SEE ALSO: That interstellar asteroid probably isn't aliens, but the hunt continues
A Saturday report in the New York Times lays out the details of a secret, Defense Department-funded "Advanced Aerospace Threat Identification Program," formed to investigate UFO reports. Among the more sensational details is the revelation that a number of buildings in Las Vegas were modified to house "metal alloys and other materials ... from unidentified aerial phenomena." Read more... More about Space , Science , Pentagon , Ufo , and Department Of Defense