June 24th is UFO Day. It is the first day a disc-like object, later termed to be a UFO (Unidentified Flying Object) was sighted floating in the air in the US in 1974. It wouldn’t be a surprise even if there were species that have yet to be discovered found on other planets in our huge universe. However, we get into a panic when UFOs appear in our daily lives. To celebrate UFO Day, we have gathered a series of illustrations about UFOs and aliens. Take a look!