Weather balloons. Atmospheric phenomena. Experimental military aircraft. There are explanations for most unknown flying objects, but not all of them. So, are flying saucers real? Many Americans believe extraterrestrial visits are possible, and in 1952, the U.S. Air Force even launched Project Blue Book, history's most extensive government investigation into UFOs. Join us as we pour over recently declassified reports, meet with science experts, and hear eyewitness accounts to see if we are indeed sharing our friendly skies.