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科学家利用两种不同的地质年代测定技术研究发现,在澳大利亚西部一个牧场发现的一小块锆石晶体,是地球上已知最古老的物质,其形成年代可以追溯到44亿年前。地球诞生于45亿年前,最初是一个由熔岩组成的星球。由这块锆石晶体的地质年龄推断,地壳在地球诞生1亿年后、即在太阳系诞生1.6亿年后形成。这一地质时期被称为冥古宙,之所以用希腊神话中的冥王来命名,
Using two different geodetic dating techniques, scientists found that a small piece of zircon crystals found on a pasture in western Australia is the oldest known substance on earth dating back to 4.4 billion years ago. The Earth was born 4.5 billion years ago and was originally a planet of lava. Judging from the geological age of this zircon crystal, the crust was formed 100 million years after the earth was born, that is, 160 million years after the birth of the solar system. This geological period known as the ancient universe, the reason for the name of Pluto in Greek mythology,