然而,当天文学家首次瞥见月球较远的那侧时,他们看到了一处截然不同的景观。早期月球探测器显示了这块多山,崎岖不平,拥有大量陨石坑以及几乎毫无大海的地域的表面。引用阿波罗8号宇航员之一,也是首次直接看到月球较远那侧的三个人之一的比尔?安德斯的话说,那块地方就像孩子们玩的沙堆一样到处都是破破烂烂的,无法解释,就是很多坑坑洼洼。
Selenologists, as those who study the moon callthemselves, have kicked around many theories toexplain the differences between the moons twofaces: Earth partly shielding the moon frommeteoritic impacts; uneven heating from beneath;the collision that excavated a 2,500km-wide craterat the lunar south pole, one of the biggest in thesolar system. None seems satisfactory. But in apaper just published in Nature Martin Jutzi and ErikAsphaug of the University of California, Santa Cruz,examine yet another idea. This is that the mountainsof the lunar far side may be debris left over from an even bigger collision than the one at thesouth polea collision that left lumps on the lunar surface rather than digging holes in it.
作为研究月球而称他们自己为月球学家的那些人已经非正式地讨论了许多理论来解释月球的两种截然不同表面的区别:地球部分地保护了月球免受陨石的碰撞;月球内部不均匀的加热;在月球南极空砸出一个2500公里宽的陨石坑---太阳系最大的陨石坑之一---的那次碰撞。好像没人对些理论满意。但是,加州大学圣克鲁斯分校的马丁?彻奇希和埃里克?阿萨福格刚刚在《自然杂志》发表的一篇论文检验了迄今为止的另一个猜想。这个猜想就是月球较远那侧的群山甚至可能是比月球南极那次碰撞更大的碰撞所留下的岩屑---这次更大碰撞在月球表面留下了隆起,而非砸坑。
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