将以下这段话翻译成英文：  
在这个世界中，直到上个月，没有任何牢固的证据能够证明地外智慧生命的存在。直到出现在离我们最近的类地行星上进行的高度机密的调查揭露了一些重要的信息，这一说法才得以改变。调查中发现了一些类似人造结构的物体，这也许是外星文明存在的第一个强烈信号。与此同时，这些发现引发了全球性的讨论，人们开始思考这些发现对我们自身意味着什么。
user
In this world, until last month, there had been no solid evidence to prove the existence of extraterrestrial intelligent life. This statement changed when a highly confidential investigation on the nearest Earth-like planet to us revealed some crucial information. The investigation uncovered objects resembling artificial structures, which may be the first strong indication of the existence of an alien civilization. Meanwhile, these discoveries have sparked a global discussion, with people beginning to ponder what these findings mean for us.
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