If they are aliens and powerful enough, why don't they attack earth? They are peace maker? 1 A: ?% c* {2 |8 B( n: [- ZTVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。Or just preparing for war? If their technolege are so advance, they can destroy us one day.