have any of u seen aliens??

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i saw this documentry in tv abt the existence of aliens,ok may be, they do exist,true,if earth can contain life there cd b planets with life,iam not here to question the vastness,or greatness of universe, but the statement abt their visit to our planet n all,and mostly the reports r frm united states,y has no one talked about them in my country,or any other country??pls be frank,have any of u seen them??