Rather, they are dark because of interstellar dust that hides the stars behind it.
相反，它们之所以是黑暗的，是因为星际尘埃将恒星隐藏在它的后面。
The interstellar material, rather like terrestrial clouds, comes in all shapes and sizes.
星际物质很像地球上的云，形状大小各异。
Optical astronomy is most directly affected, for although interstellar gas is perfectly transparent, the dust is not.
光学天文学受到最直接的影响，因为虽然星际气体是完全透明的，但尘埃却不是。
The average density of interstellar material in the vicinity of our Sun is 1,000 to 10,000 times less than the best terrestrial laboratory vacuum.
在我们的太阳附近，星际物质的平均密度比最好的地球实验室真空还要低1000到10000倍。
Scientists think it will enter interstellar space in about four years.
科学家相信四年内它将进入星际空间。
But for other astronomers, interstellar dust is useful in its own right.
但对于其他天文学家而言，星际尘埃自身确是有用的。
The interstellar cloud of gas and dust is an active star-forming region.
由气体和尘埃组成的星系云是一个恒星形成的活跃区域。
Light and radio waves are absorbed and scattered by interstellar gas and dust.
光波和无线电波能被星际气体和尘埃吸收及散射。
The shock acts as a searchlight by revealing the structure of the interstellar medium.
冲击波能揭示出星际介质的结构，扮演着探照灯的角色。
This is a prerequisite for having the technical smarts to achieve interstellar travel.
这是拥有可以进行星际航行的技术的先决条件。
Flying along at about 38,000 MPH, Voyager 1 is continuing its beeline toward interstellar space.
旅行者1号继续以3.8万英里的时速直线飞向星际空间。
Our solar system arose from a large, rotating cloud of interstellar debris called the solar nebula.
太阳系形成于一个巨大的旋转星云——太阳系星云，星云中含有大量的星际残骸。
A continuous broadcast powerful enough to reach across interstellar space takes a huge amount of energy.
持续的广播足够到达星际空间，那要消耗巨大的能量。
In order to achieve interstellar travel, Matloff stresses that less mass and more of a solar push are key.
为了实现星际航行，马特罗夫强调，更轻的飞船质量以及更强的太阳光推力是关键。
This is not the first time that beams of neutrinos have been proposed as a means of interstellar communication.
使用中微子束作为星际通信手段并非是首创。
Elliptical galaxies contain many older stars, up to one trillion, but little dust and other interstellar matter.
椭圆星系中有多达万亿颗古老的恒星，但几乎没有灰尘和其他星际物质。
The resulting image highlights the bright swept-back ridges that outline pockets of cool interstellar dust and gas.
得出的图片突出显示了星际尘埃和气体群的轮廓所形成的明亮的后掠式突起。
Project Icarus is an ambitious five-year study into launching an unmanned spacecraft to an interstellar destination.
伊卡洛斯计划是一项为期五年的雄心勃勃的研究，将发射一颗无人航天器到某个星际目标。
It appeared to come from somewhere beyond the fixed stars, and brought the chill of the interstellar Spaces with it.
声音好像来自星辰，夹带着星际的寒冷。
There is still a significant gap in current propulsion technology and what may be needed for an interstellar mission.
我们现有的推进技术和我们需要的应用于星际飞行的推进技术仍然有很大的差距。
But it's not completely empty, as a new map of the interstellar space in the 1, 000 light-years around the sun shows.
但它又不是完全的空无一物，正如这张最新的太阳周边1000光年范围内星际空间地图所示。
That's what happened 4.6 billion years ago, when the sun and the Earth emerged from a now-vanished interstellar nebula.
那是46亿年前发生的事情，当时太阳和地球出现在如今已经消失了的星际星云中。
The Voyager 1 spacecraft is poised to leave the solar system and reach interstellar space. In fact, it may already have.
航海家1号宇宙飞船随时可能飞出太阳系进入星际空间，事实上，它可能已经做到了。
It's therefore easy to grow skeptical about the prospects for an interstellar mission that could be launched this century.
因此很容易让人对在本世纪开始的星际任务的前景产生怀疑。
Some of these systems might be used on the Icarus interstellar spacecraft itself, and others may play supporting roles.
这类新技术的一部分有可能直接用于伊卡洛斯飞船上，而另一部分将可能是辅助系统。
Sculpted by stellar winds and radiation, a magnificent interstellar dust cloud by chance has assumed this recognizable shape.
由恒星风和恒星辐射雕塑的壮丽的星际尘埃云，碰巧呈现这易辨认的形状。
The region features immensely powerful blue stars, which light interstellar dust grains, producing the blue part of the glow.
这个区域的主要特征是极其强大的蓝色恒星，这些恒星使星际尘埃颗粒发出光照中蓝色部分的光。
The region features immensely powerful blue stars, which light interstellar dust grains, producing the blue part of the glow.
这个区域的主要特征是极其强大的蓝色恒星，这些恒星使星际尘埃颗粒发出光照中蓝色部分的光。
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