U.F.O

Nick Pope, who investigated U.F.O. sightings for Britain’s Ministry of Defense, a position that turned him from skeptic to believer and later made him one of the world’s most respected ufologists, often likened to F.B.I. agent Fox Mulder on “The X-Files,” died on April 6 at his home in Tucson, Ariz. He was 60. The…