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Unidentified Flying Object - UFO is an object observed in the sky that is not identified. From an another point of view some people believe that these unidentified flying objects are actually spacecrafts from some other planets. It has been the subject of investigation by various governments who have provided records related to this subject.  Many a time UFOs are nothing but misidentified secret military crafts, hoaxes or delusion. But not all the time, there are concrete evidences that whatever these objects are, they are capable of extraordinary speeds and maneuvers. Some of them were tracked on military radar too.  Are we alone in the Universe? Unfortunately neither of the answers from the space scientists feel adequate. Time to time scientists admit that extraterrestrials may have already visited the Earth long ago or may be they are still visiting the Earth but there has never been a straight answer from NASA or from the scientists. These ufos could be the evidences for the visita