It would be good to be able to travel light, but I end up taking too many clothes.
能够轻装旅行再好不过，但我最终还是带了太多衣服。
It weighted only 180 grams and required very little storage space, making it perfect for anyone wishing to travel light.
它只有180克，几乎不占用储存空间，非常适合想轻装旅行的人。
Today people and goods travel by jet aircraft and fast ships, and information is transmitted at the speed of light over the Internet.
人和货物通过喷气式飞机和快船来流动，而信息是通过互联网以光的速度传送。
这些天我“轻装上阵”。
Even if ET has mastered building a rocket that can travel at the speed of light, he may be lying dead inside a weakened craft .
即使外星人已经掌握了制造一枚能以光速飞行的火箭的技术，他也可能死在了一架飞船里。
And so as we move out, we see continuously from our planet all the way out into the real of galaxies as we see here, light travel time, giving you a sense of how far away we are.
接下来让我们向外太空移动，我们看到，持续不断的从我们星球的各个角度进入到真实的银河系，就像我们在这里看到的一样，让旅行的时间发光，给你一种我们的存在是如此深远的感觉。
I usually answered that I'd always liked to travel light, and that going without any bags at all sounded like a fun challenge.
我常常这样回答，我喜欢轻便的旅行，所以把不带行李去旅行当作对自己的有趣的挑战。
Some of this light would then travel back to the door and be reflected into the camera.
其中一些光会向门这个方向反射回来并又被反射回相机中。
It is impossible to travel faster than the speed of light, and certainly not desirable, as one's hat keeps blowing off.
不可能旅行得比光速更快，当然也不希望这样，因为你的帽子老是会被吹掉。
To travel light, I tried to avoid packing anything heavy, but one weighty item I always carried with me — a guidebook.
为了轻装旅行，我总是尽量不带重的东西，但有一样有分量的东西我总是带在身边，那就是旅游手册。
Because nothing can theoretically travel faster than the speed of light, nothing escapes once it's passed the event horizon.
因为理论上没有任何物体的速度会快过光速，所以一旦进入视界，任何物体都不能逃离。
But light can also travel at a more leisurely pace, slowed, for example, by air or water.
但是光同样可以以一种稍缓的速度行驶，比如它会因为在空气中或水中而被减慢速度。
I can ask myself now the question, how far does electromagnetic radiation, how far does light travel in the time of one period capital t?
现在我们能问，电磁辐射，有多远，光在一个周期T内，行进了多远？
They are very nearly massless and thus, even at moderate energies, we'd expect them to travel essentially at the speed of light.
它们的质量非常接近零，因此，即使在中等能量下，我们也希望它们以光速传播。
Some of this light would then travel back to the door and be reflected into the camera.That much is basic optics.
它不记录直接反射回来的光线，而是记录下在进入相机前被反射过多次的光。
But at that time, the light pulses could travel only about 20 meters through the glass fibers before 99 percent of the light had dissipated.
但是在那个时候，光脉冲在玻璃光纤中只能穿行20米，99%的光都被损耗了。
I’ve tested my new system of “extreme light travel” on a few trips now; and I’m happy to say, it’s worked like a dream!
这种“轻装出行”我在一些旅行中已经试过了；可以很高兴地说，这简直和做梦一样！
So fast does the light travel that it is difficult for us to imagine its speed.
光传播的很快我们无法测量其速度。
I applaud Rolf for pushing the boundaries of light travel, and look forward to following his journey.
我赞成Rolf推崇的跨越界限的轻装旅行，期待他下一次的旅行。
Although previous studies have found that the "group velocity" of light can travel faster than c, the "signal velocity" -the speed at which information travels -cannot.
尽管先前的研究已经证实，光的“群速度”可以超越光速c，而“信号传播速度”——光携带的信息的传播速度——不能超越光速。
"Instead of having light travel in air, it travels within the lens," he says.
Bathiche解释说：“光线在这种镜片的内部传播，而不像普通镜片那样在空气中传播（和光纤非常类似）。
If you can travel 36 light-years-roughly 212 trillion miles-to a new planet discovered by astronomers, you might just be in luck.
假如您能旅行36光年，或者大约212万亿英里，到天文学家发现的一棵新行星上去，您一定会走运的。
If you can travel 36 light-years - roughly 212 trillion miles - to a new planet discovered by astronomers, you might just be in luck.
假如您能旅行36光年，或者大约212万亿英里，到天文学家发现的一棵新行星上去，您一定会走运的。
Can we skirt Einstein's theory of special relativity and travel faster than a beam of light?
我们能否绕过爱因斯坦狭义相对论的理论使得移动速度超越光速？
Since light does not travel through walls, there would be no need to worry about neighbours snooping on your e-mail, or piggybacking on your broadband connection.
因为光线并不能穿透墙壁，所以根本不必要担心你的邻居偷窥你的电子邮件或者盗用你的宽带连接。
Even with today's radio equipment, the messages will take minutes-sometimes hours-on their journey, because radio and light waves travel at the same limited speed of 186, 000 miles a second.
即使有今天的无线电设备，信息传播也需要好几分钟，有时候甚至好几个小时，因为无线电和光波都是以每秒186,000英里的有限速度传播。
If you've been reading this blog for awhile, you know I like to travel light.
如果你看我的博客已经有一段时间了，你应该知道我喜欢轻装旅行。
Nothing can escape a black hole's gravity because nothing can travel faster than the speed of light.
任何东西都不能逃脱黑洞的引力，因为没有任何东西的速度能超过光速。
For it seems as certain as anything can be that no signal-still less any material object-can ever travel faster than light.
看起来非常确定的事情是：没有信号，更不用说物质，可以比光传播的速度快。
Rural people travel light—none of the Weis had brought anything with them, not even Wei Jia, who planned to stay with me in the city to see more of the Games.
农村人出门一身轻---魏家人一点儿东西都没有带，甚至是小魏佳，他打算和我呆在城里继续看多几场比赛。
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