“UFO” (** out of four) was a dour sci/fi conspiracy thriller about a college student (Alex Sharp) who witnesses a UFO and consults with his stern professor (Gillian Anderson) and his friends to investigate its mathematic and scientific origins while the FBI (led by David Straithairn) follows closely behind. Story about alien sightings, government coverups, and paranormal activity is weirdly earthbound and you wish it were more fun. Sharp is strong in the lead role and Anderson is amusingly cast since she’s the star of “The X Files.” For a more entertaining look at a very similar story, watch 1996′ “The Arrival” instead.