i don't know is there any undefined flying objet or not? But lost of people beleve that they have seen ufo .and most of people think that they have very advance weapon and other things so if they attck on earh then we can not protect ourself.sometimes peopesaid that somewhere part of word some people has been kidnapped by ufo and they are studying our body stracture and they killed us for thease purpose but we don't found any facs on this because our science also has done very progress so scientist has achive very strong any powerful wepon to protect us some people arte spreadind that types og message to being famious so but i am tellint that there is no any ufo....because many people clam that thay have seen ufo and they belive on this .so we have to aware that is there anf ufo ?and we have to decide that what is truth?