PTE听力口语练习-科学60秒-Jellyfish Galaxies

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,PTE听力口语-科学60秒-Frosty Moss练习记笔记技巧和复述。废话少说,下面开始:

Jellyfish Galaxies Get Guts Ripped Out


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。

A recently discovered breed of galaxies really caught astronomers’ attention. Because they look like jellyfish.

Astronomers found the first jellyfish galaxy a decade ago. Such a galaxy has a disk of stars, like our Milky Way°™plus long blue tendrils. A jellyfish galaxy was once a spiral like the Milky Way, spawning new stars from its gas and dust. But unlike the Milky Way, a jellyfish belongs to a cluster of galaxies.

A recent analysis of Hubble telescope images led to the conclusion that extremely hot gas from the cluster is behind the formation of jellyfish. That study is in the Astrophysical Journal Letters. [H. Ebeling, L. N. Stephenson, and A. C. Edge, Jellyfish: Evidence of extreme ram-pressure stripping in massive galaxy clusters]

As the galaxy plows through space, this hot gas rips out the galaxy’s own gas and dust, forming the long streamers behind the galaxy. This torn-out gas still gives birth to new stars. The brightest of these newborn stars shine blue. So the former disc-shaped galaxy metamorphosizes into a celestial jellyfish sporting long blue tendrils.

The galaxy will eventually literally run out of gas, and thus lose the ability to create any more new stars. Jellyfish in the sea can be deadly. But in space, the mortally wounded victim is the jellyfish galaxy itself.

–written by Ken Croswell, voiced by Steve Mirsky



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