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在地球诞生至今的46亿年的演化过程中,地球上的生物历经了5次大灭绝,生生死死,周而复始。因而有人推断,地球上曾出现过多次高级文明社会,但不幸的是这些文明都毁灭了。亿万年的自然变迁几乎抹去了一切痕迹,只有少数证据得以保存。1972年,在非洲加篷共和国发现了一个20亿年前的铀矿——奥克洛铀矿。在矿里还发现了一个不可思议的史前遗迹:一个古老的核反应堆。它是由六个区域的大约500吨铀矿石组成,运转时间长达50万年之久。面对这个保存完好、结构合理的核反应堆,人们不禁要问:是谁留下了这个核反应堆?要知道,人类掌握核能技术,建立第一座核反应堆,只是20世纪40年代的事情。1968年,在美国发现了两个完整的人类足迹化石,而且这个足迹踩着地球上最古老的一种生物——三叶虫(这种生物早在几亿年前就灭绝了)。值得说明的是,这个人类足迹的化石在地质上属于寒武纪,距今已有5亿年之久。请问,在这么遥远的年代,是谁留下了这些脚印?
In the evolutionary process of 4.6 billion years since the birth of the Earth, the creatures on Earth have experienced five extinctions and are experiencing life and death. Some people have therefore concluded that there have been many high-level civilizations on Earth, but unfortunately these civilizations have been destroyed. The natural changes of millions of years have almost erased all traces and only a small amount of evidence has been preserved. In 1972, a 2 billion-year-old uranium ore-uranium deposit was discovered in Gabon, Africa. Also found in the mine an incredible prehistoric site: an ancient nuclear reactor. It is made up of approximately 500 tonnes of uranium ore in six areas and has been operating for as long as 500,000 years. Faced with this well-preserved and well-structured nuclear reactor, one can not help but ask: Who left the nuclear reactor? It is only the 1940s that mankind mastered nuclear energy technology and established the first nuclear reactor. In 1968, two complete human footprints were discovered in the United States, and this footprints stepping on the trilobite, the oldest creature on the planet (extinct hundreds of millions of years ago). It is noteworthy that this human footprints fossils geologically belong to the Cambrian age, 500 million years ago. May I ask, in such a distant age, who left these footprints?