The government's released secret files containing pictures drawn by people who think they've seen UFOs - unidentified flying objects.
This drawing was done by a policeman, who says he spotted this flying saucer in 1983.
If flying saucers really exist, why don't many of us see them? Well, the person who drew this thinks aliens use things like the white ball underneath the spacecraft to confuse us.
And while most of the drawings are of flying saucers, one person thinks alien spacecrafts look more like this!