今天前程百利小编为大家分享的是托福听力天文学必备-隐形星系。小编已经把段子里的疑难词汇、疑难语法和段落大意分析出来了，大家可以参考一下，多积累一些背景知识，攻克托福听力。
Astronomers have discovered more than 800 so-called "ultradiffuse(极端传播) galaxies" that are virtually(事实上) invisible because they have relatively few stars and are mostly dark matter.
段落大意：在《科学人60秒钟》里面第一段都是本篇文章的主要内容。本篇文章的主要内容是天文学家发现了多于800的极速传播星系，这些星系实际上是隐形的他们中又很少的恒星，大多都是黑暗物质。
疑难句：that引导的定语从句
Astronomers have discovered a trove(被发现的东西) of galaxies that are virtually invisible—because they’re made almost entirely of dark matter. The Subaru telescope in Hawaii spotted 854 of these oddballs(怪球), which are referred to as “ultradiffuse galaxies,” by detecting what little light they do produce. They were all found in what’s called the Coma Cluster of galaxies.
段落大意：天文学家发现的星系是隐形的的，这些星系被称为后发星系团星系。
疑难句：第一句that引导的定语从句;第二句which引导的非限制性定语从句+伴随状语;第三句what引导的宾语从句。
Of course, scientists still do not know just what dark matter is. But they can detect its presence through its gravitational effects(重力效应) on the normal matter that we can see. That’s how we know that dark matter seems to be ubiquitous(普遍存在) in the universe—especially in these newly found, barely visible galaxies.Many of these galaxies are about the size(约一样大) of our Milky Way, but contain just a thousandth(千分之一) as many stars. Researchers estimate that dark matter accounts for 99 percent of these galaxies’ mass.
段落大意：科学家知道那些隐形星系黑色物质是什么。那是普遍存在于宇宙中的，但是在其他的宇宙只有千分之一。
疑难句：第一句what引导的宾语从句;第二句that引导的宾语从句;第三句how引导的方式状语+that引导的宾语从句;最后一句是that引导的宾语从句。
How such objects could form is a mystery. They probably started out with a healthy complement(补足) of star-forming gas, just like normal galaxies, but somehow lost it. The gas might have blown away as the galaxies moved through the Coma Cluster, or maybe other galaxies’ gravity dragged it off. Further study of these ultradiffuse galaxies should clarify (澄清)the situation, and may even shine some light on the fundamental nature of dark matter.
段落大意：黑色物质是怎么形成的这是一个谜。将会有更多的研究澄清这些事实。
好了，以上就是前程百利小编为大家整理的托福听力天文学必备-隐形星系。相信大家一定有所收获，希望能在备考的路上助大家一臂之力。最后，小编祝大家在托福考试中取得好成绩!
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