Do alien exists?

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I always think about Aliens and UFO's when ever i read about something outside the box ..........Do aliens really exists ? have you ever seen any UFO's? Sylvia brown is the physic and she announce in Monetl show that alien will show them self in the year of 2010.........You never know the universe is pretty big.... I also think Government hide stuff..... I think probably because they don't want to freak people out.