Anyone in Germany who thinks they have seen an unidentified flying object, or UFO , can notify the Central Research Network for Anomalous Phenomena, better known as CENAP — a UFO research network. One of CENAP's hotlines, run by Hansjürgen Köhler and a five-person team of volunteers, is based in Germany's southwestern Odenwald region.

Köhler is friendly and chatty man in his late 60s. He became a salesman early in life because he was not allowed to become an astronomer. At the time, his father advised him to "do something respectable." That meant that Köhler's love of space would have to remain a hobby — albeit one he still takes very seriously.…