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。
Innovations and the Future of Interstellar propulsion.
星际推进器的革新和展望。
Interstellar Medium: What astronomers call all that stuff between the stars.
星际介质：即天文学家所称的恒星间的物质。
It would have run afoul of Jupiter and been chucked into interstellar space.
他可能与木星运行相冲突并被抛到了星际空间。
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。
A classic dark nebula, the Snake is a tendril of interstellar gas and dust about 650 light years away.
在经典黑暗星云中，蛇是星际气体和尘埃组成的卷须，长约650光年。
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。
Satellites that orbit close to major galaxies eventually forfeit their interstellar gas to the greater galaxy.
那些近距离围绕主要星系轨道运行的卫星最终将它们的星际气云失给了更大的星系。
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。
The heliopause was expected to be a rather sharp boundary between the sun's domain and interstellar space.
太阳风顶层曾被认为是处在太阳系区域和星际宇宙之间一层电磁波动极其强烈的区域。
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。
Kent think he knows why: Perhaps only the wiliest of alien species survive the interstellar version of evolution.
肯特认为他找到了答案：或许只有最为狡诈的外星种族才能挺过从大陆文明向太空文明过渡的挑战。
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。
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。
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。
With no charge and practically no mass, high-energy neutrinos pass unperturbed through interstellar magnetic fields.
高能中微子没有电荷，事实上，甚至没有质量，所以它们可以毫无阻碍地通过星级间的磁场。
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。
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。
The present day interstellar dust is weighed by measuring the intensity and color of emission at longer infrared wavelengths.
至今星际尘埃是通过测量长于红外线的波长的强度和发光颜色来权衡。
The present day interstellar dust is weighed by measuring the intensity and color of emission at longer infrared wavelengths.
至今星际尘埃是通过测量长于红外线的波长的强度和发光颜色来权衡。
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