在线词典,在线翻译

BBC听力:地球或许曾有两个月亮

所属:听力板块 阅读:1970 次 评论:2 条 [我要评论]  [+我要收藏]

小编摘要:科学杂志《自然》上的一项新的研究报告认为地球可能曾经拥两个月亮,不过在天体碰撞后,比较小的一个消失了。

 

内容提要: 科学杂志《自然》上的一项新的研究报告认为地球可能曾经拥两个月亮,不过在天体碰撞后,比较小的一个消失了。科研人员认为,碰撞过程可能相当缓慢导致月球上出现了鲜为人见的凹凸不平的高地结构。

 

This new theory builds on the idea that around four billion years ago the Earth was struck by a Mars-like planet, but instead of the smash producing enough debris for one moon, this paper argues there was enough for two.

This small second moon become stuck in a gravitational tug of war between the Earth and its much larger sibling. After millions of years in this position the new moon was drawn into a collision at a speed of less than three kilometres per second.

The scientists say this slow paced crash may have caused a build up of material and the formation of highlands on the Moon's far side.

For decades scientists have been trying to understand why the visible near side of the Moon is covered in craters while the far side has mountain ranges higher than 3,000 metres.

The researchers hope that Nasa observational missions might prove this new theory within a year.

标签:BBC
正在加载单词列表...
11
2011-08-12 09:56 编辑:mrjiong
分享到:
关注海词微博:
发表评论:
表达一些您的想法吧!已有2条评论>>
登录,再发表评论
文明上网,理性发言!
最新评论:
您可能还感兴趣的文章:
  • [成长励志]BBC英语教师谈听力

    In some ways I am not the best person to give advice here, because whenever I have studied a language, listening has always been my weakest area. I have to say, my experience as a
  • [影视英语]BBC地球 (看一看吧)

    简介: 《地球》是一部前所未有的吸引影迷眼球的大型记录片,它是BBC获奖电视连续剧《行星地球》的套拍片,片长90分钟,讲述了北极熊、大象和鲸鱼三个家庭的故事,展示了动物母亲与其新生幼儿之
>>精华推荐阅读
热门评论文章