Earth may once have had two moons - the one that shines at night today and a smaller companion, according to a new theory. A slow-motion collision between the two is believed to have created the mountainous highlands on the moon's far side, as debris from the second, smaller moon piled up. The side of the moon facing the Earth and the side facing away have strikingly different topographies. While the near side is relatively low and flat, the far side is high and mountainous with a much thicker crust. 日本作家村上春树的小说《1Q84》模拟了一个虚幻的场景:虚幻场景中天空会出现两个月亮,近日,某杂志以《地球曾拥有两个月亮》作为标题宣告了两个月亮可能不是幻想,因为美国圣克鲁兹大学行星科学家和瑞士伯恩大学的一组科学家提出了新的观点:地球早期确实存在两个月亮,现在我们在地球上看到的“一轮独月”其实是一个大月亮“吞噬”了小月亮最终形成的,两个月亮的撞击行程了如今月球坑坑洼洼的表面,以及略小的那个月亮最终被“吞噬”的事实。科学家还发现,如今月球靠近地球的表面相对比较平坦、光滑;而远离地球的表明地势起伏不定,有着较厚的地壳。
The moon and how it was created has fascinated mankind since the earliest times. Records show that as early as the 5th century BC, civilisations in Babylon had mapped out lunar eclipses while Indian astronomers had worked out its monthly elongation. The Greek philosopher Anaxagoras argued that the moon reflected the sun's light and by the second century the moon's measurements had been accurately calculated. But there was little further development in our understanding of the moon until Galileo Galilei drew one of the first telescopic drawings of the moon and noted that it was not smooth but had mountains and craters. Telescopic mapping of the moon then developed throughout the 17th century. The Cold War between the U.S. and Soviet Union in the second half of the last century inspired further exploration of the moon, with the two superpowers competing to be the first to land a man on the lunar surface. By 1959, Russia had sent spacecraft to the moon and in 1966 Luna 9 achieved a 'soft landing'.
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2020-09-15
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