科学家在澳大利亚发现了一批微小锆石晶体 ,同位素分析表明它们的“年龄”约为 43亿至 44亿岁 ,是迄今发现的地球上最古老的固态岩石样本。科学界一般认为 ,地球诞生于约 45亿至 46亿年前。由于以前发现的最古老岩石样本“年龄”约为 40亿岁 ,科学家们因此推测说 ,幼年的地球表 Scientists have uncovered a group of tiny zircon crystals in Australia. Isotope analysis shows that their “age” is about 4.3 billion to 4.4 billion years old and is by far the oldest solid rock sample on Earth. The scientific community generally believes that the Earth was born about 4.5 billion to 4.6 billion years ago. Because the “oldest” rock sample ever found was about 4 billion years old, scientists speculated that the Earth’s Table of Juveniles