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

Dwarf Galaxies Really Cooking with Gas


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。

[Audio of Twinkle, Twinkle, Little Star] As kids, many of us pondered what stars are made of. [bars of twinkle twinkle?]. Some grown-up astronomers, on the other hand, wonder about where stars came from.

Now, a study serves up a surprise. Because it seems that the smallest galaxies in the universe gave rise to an unexpectedly large proportion of stars. The findings are in the Astrophysical Journal. [Hakim Atek et al, Hubble Space Telescope Grism Spectroscopy Of Extreme Starbursts Across Cosmic Time: The Role Of Dwarf Galaxies In The Star Formation History Of The Universe]

Most of the stars we see in the sky were formed when the universe was young, just a few billion years after the Big Bang. So to study stellar origins, scientists use telescopes that allow them to see galaxies that are so far away, they’re essentially looking back in time.

Previous observations had focused on the star-forming powers of larger galaxies. But in this latest study, researchers used data collected by a powerful camera aboard the Hubble Space Telescope. With this instrument, they could eyeball smaller, dwarf galaxies. And they found that these diminutive dynamos churned out stars at a furious rate, fast enough to double their mass in only 150 million years. That reproductive feat would take most so-called “normal” galaxies one to three billion years.

Seems the universe has long known what Danny Devito, Michael J. Fox and Dustin Hoffmann later proved: You don’t have to be big to have real star power.

—Karen Hopkin


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