Do you believe in mysterious???

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We all often read such news on newspaer,somebody found something at somewhere,and such kind of things are usually beyond our understanding. Thus they are miracles or mystery,or something. Do you believe in there maybe others creature exist in other stars and they maybe have the developed civilazition?Some people claimed that they all have ever seen UFO,and is this true?If it is true,what are their's aims to our earth?? Can you share your idea with us ??