One couldn't make out what the dark mass was from a distance.
远处黑压压的一片，看不清是些什么东西。
A dark mass of trees loomed in the distance...
远处是一片黑糊糊的树林。
Night enshrouding the earth, nobody could make out what the dark mass was from a distance.
黑夜笼罩着大地，谁也看不清远处黑压压的一片是什么东西。
He saw the white naked line of his backbone and the dark mass of the head with the projecting bill and all the nakedness between.
他看清它赤露的脊骨象一条白线，看清那带着突出的长嘴的黑糊糊的脑袋，而在这头尾之间却一无所有。
She held one hand to her forehead, and bending slowly, she reached out with her free arm, nearly touching a dark mass lying in the road.
她一手捂着额头，慢慢地弯下身子，伸出另一只胳膊，摸向躺在路上的一团黑色的东西。
She held one hand to her forehead, and bending slowly, she reached out with her free arm, nearly touching a dark mass lying in the road.
她一手捂着额头，慢慢地弯下身子，伸出另一只是胳膊，摸向躺在路上的一团黑色的东西。
Dark matter is an invisible form of matter that accounts for most of the Universe's mass.
“暗物质”是一种以不可见的形态存在的物质，它构成了宇宙的大部分质量。
Dark matter is thought to be an invisible substance that makes up almost a quarter of the mass in the universe.
人们认为暗物质是由将近占宇宙四分之一质量的不可见物质组成的。
To convert measurements of the Milky Way's rotation speed to mass, astronomers must rely on models of how dark matter is distributed in the galaxy.
要把银河系的转速转换成质量，天文学家要依靠模型，而这模型能显示暗物质在星系中是怎样被影响的。
"This is basically a new method to render dark galaxies visible," she said, adding that her technique should be able to detect dim dwarf galaxies as small as a thousandth the mass of the Milky Way.
“这在根本上是一个使暗星系可见的全新方法，”她说道，通过她的方法将使得小到只有银河系千分之一质量的暗矮星系能被观测到。
Astronomers who study star clusters have noticed that the speed at which a star of a given mass spins (measured by tracking cool, dark spots on the surface) also seems to vary predictably with age.
研究星团的天文学家已经注意到质量一定的行星(通过追踪表面阴暗冷却斑点来测量)，其旋转速度随着其星龄呈现可预测性的变化。
Yet this palaeontological paradise holds a dark secret: the mass deaths were not caused by a single event.
然而，这片古生物乐土却隐藏了一个秘密：如此大量的死亡并不是一次事件导致的。
Much indirect evidence for dark matter — supposedly 25 percent of the mass in the universe — comes from observing its invisible gravitational effect on visible galaxies and their stars.
据推测不可见的暗物质占到宇宙总质量的25%，其存在的间接证据主要是由于观察到其施加在星系和恒星上的引力作用。
While it emits no light, this dark matter far outweighs the Milky Way's hundreds of billions of stars, giving the galaxy a total mass one to two trillion times that of the sun.
这种黑物质不发光，但它远远重于银河系数以亿计的恒星，使银河系的总质量达到太阳的一至二万亿倍。
Overall, dark energy is thought to contribute 73 percent of all the mass and energy in the universe.
总的来说，一般认为暗物质占据了宇宙中73%的质量和能量。
Ibata explained that the cosmic web filaments are held together by dark matter, unseen stuff that makes up 85 percent of all mass in the universe.
Ibata说，宇宙网络的丝状物是由看不见的暗物质维系在一起的。宇宙中85%的质量都是暗物质。
"At first I saw a series of dark faces, like death masks, flying toward me and being crushed," writes Clinton, whose book comes out May 31 in both trade and mass market paperback.
《我的生活》的普及式平装本和大众式平装本将于5月31号同时上市。克林顿在书中写到：“我先看到一些像死神面具一样的黑脸，它们向我飞来，接着又被碾碎。”
Based on general relativity, for example, scientists think dark matter exists because some cosmic objects behave as if they have more mass than we can see.
例如，基于广义相对论，科学家们认为暗物质的存在是因为宇宙物体的运转表明似乎它们有比我们能观测到更大的质量。
This dark matter provides the extra mass, which in turn creates gravitational fields strong enough to hold the clusters together.
这些暗物质轮流产生重力场以提供足够的附加质量将星团聚集在一起。
We'll address soon some of the major puzzles of modern physics like the origin of mass, the grand unification of forces and the presence of abundant dark matter in the universe.
在不久的将来，我们将开始揭开现代物理里面一些主要的谜团，如物质起源，作用力的大统一和宇宙中大量存在的暗物质等。
The unseen stuff is known as dark matter, and accounts for just under a quarter of the mass in the universe.
这些看不见的物质即俗称的暗物质，不过它只占据了宇宙不到四分之一的质量。
Thanks to dark energy-as the source of the acceleration is loosely labeled-the dynamics of our expanding universe can be reconciled with its modest mass content.
由于被大致认为作为加速源的暗能量的提出，我们膨胀的宇宙的动力学可以与它适度的物质含量相一致。
Sunspots are dark patches marking magnetically active regions that often host solar flares and violent belches called coronal mass ejections.
黑子是太阳表面比较暗的区域，也叫活动区。那里经常发生耀斑和日冕物质抛射等剧烈的喷发现象。
It was only the mice that changed their eating times that gained weight, taking on a body mass gain of about 50 percent more than their standard light-dark cycle counterparts.
那些改变进食次数的老鼠，与在正常日夜循环的环境下的老鼠，体重增加的比率多了50%。
Its dark-red mass was like something that had just been splodged out of a tin.
这深红色的一大片就像被罐头弄脏了的一块污渍。
And ultraviolet light will interact with that little ball, the center of mass, and when I then make it dark, you will only see the motion of the center of mass.
这紫外线光可以，与小球互动，也就是质量重心，当周围暗下来，能看到质量重心运动。
If so, the mystery of dark matter (much of the universe's missing mass) could be solved in addition to creating a more formidable standard model of physics.
如果是这样的话，暗物质(宇宙中遗失的大团中的很多)的神秘性在创造出一个物理学上更强大的标准模型的条件下就可以被揭开了。
An important discovery in science in the past few decades is most mass and energy in the universe is dark.
在过去的几十年中，科学上的一项重大发现是：宇宙中的大部分物质和能量是黑暗的。
Astronomers nicknamed this unseen mass dark matter.
天文学家将这种不可见物质通俗地称为暗物质。
Astronomers nicknamed this unseen mass dark matter.
天文学家将这种不可见物质通俗地称为暗物质。
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