Spotting UFOs with Tech

"What was that strange light in the sky? No one knows! It's an unidentified flying object, or UFO. Many UFOs turn out to be airplanes or clouds. But some people say aliens visit Earth in UFOs. Could that be true? Researchers use cameras, magnetic field sensors, telescopes, radar, and other gear to find out. Get an inside look at the high-tech tools used to study UFOs"--