About UFO -- are they really there?

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Have u anytime heard of UFO? i.e. Unidentified flying objects. Mostly in western countries people claim that they have seen UFO coming from outer space and they say that they have seen people from other planets and they even claim that they have taken photos of them. But how far it is true? has anybody from any country seen an UFO or a flying saucer and taken a photo. anyone can share their experience