PTE听力口语练习素材:科学60秒 — Giant Black Hole Spins at Half Light-Speed

PTE考生目前最大的问题之一就是练习题缺乏。除了有限的基本官方书(PLUS,Testbuilder, OG)之外就没有题了。很多英语基础不是很扎实的同学很难找到练习材料。墨尔本文波雅思PTE培训学校专门为墨尔本,悉尼PTE考生准备了适合PTE听力阅读练习的科学60秒。各位PTE同学可以练习PTE听力中的summarise spoken text和PTE口语中的retell lecture,练习记笔记技巧和复述。废话少说,下面开始:

Giant Black Hole Spins at Half Light-Speed


60秒科学节目(SSS)是科学美国人网站的一套广播栏目,英文名称:Scientific American – 60 Second Science,节目内容以科学报道为主,节目仅一分钟的时间,主要对当今的科学技术新发展作以简明、通俗的介绍,对于科学的发展如何影响人们的生活环境、健康状况及科学技术,提供了大量简明易懂的阐释。

Two remarkable things about a giant black hole called RX J1131 at the center of a galaxy some 6 billion light years away. One: it’s the farthest black hole to have its spin measured. Two: it’s spinning at half the speed of light. That’s according to a report in the journal Nature. [R. C. Reis et al., Reflection from the strong gravity regime in a lensed quasar at redshift z = 0.658]

Astronomers have wondered, do large black holes grow gradually via steady intake of material; or quickly, for example, in a merger with another black hole during a galactic collision. Spin offers clues.

If the merger idea is correct, lots of new material flowing in a single direction feeds a black hole, driving the spin faster one way.

But a black hole that ate small meals from different directions would receive tiny pushes that cancel each other, and leave the black hole spinning slowly.

The half-the-speed-of-light-fantastic being tripped by this newly analyzed black hole thus suggests it grew by digesting another black hole in a galaxy merger.

Our own Milky Way’s black hole could be in for a similar fate when we collide with our neighbor, the Andromeda Galaxy. Relax, it’s not for another fourbillion years.

-Clara Moskowitz


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