这种以每秒数百公里的速度旋转的运动，可能会使圆盘上的物质呈现出螺旋形状。
This spinning motion, at speeds of hundreds of kilometers per second, may cause matter in the disk to take on a spiral shape.
如果一架宇宙飞船飞行超过每秒11公里，它就能摆脱地球引力。
If a spacecraft travels faster than 11 km a second, it escapes the Earth's gravitational pull.
每秒几百公里的旋转速度可能使圆盘里的物质呈现象宇宙玩具风车一样独特的螺旋形。
This spinning motion, at speeds of hundreds of kilometers per second, may cause matter in the disk to take on a distinctive spiral shape like a cosmic pinwheel.
双子座流星雨相较于其它流星雨来说，速度较慢，为中速，约每秒35.41公里，肉眼容易观测。
Geminid meteors are fairly easy to spot because they travel at about 35.41 km per second, which is relatively mild compared to other forms.
该流星群速度可达每秒66公里。
The shooting stars are falling at a speed of 66 km per second.
光速大约为每秒300,000公里(即每秒186,000英里)——非常之快。
Light travels at about 300, 000 kilometers per second (186, 000 miles per second) — that's pretty fast.
这个爆炸，超新星的爆炸,以高速抛出,行星的外层,速度是一千公里每秒，甩到宇宙空间里，这就是你们所看到的。
The explosion, the supernova explosion throws the outer layers of the star with a huge speed some 10,000 kilometers per second into space, and that is what you are seeing.
电磁波，以光速传播，也就是30万公里，每秒。
Electromagnetic waves travel with the speed of light, which is 300,000 kilometers per second.
几百万年后，此状况下的新月亮以低于每秒3公里的速度要对撞了。
After millions of years in this position the new moon was drawn into a collision at a speed of less than three kilometres per second.
这个成分，是vcosθ,我们叫做径向速度-,等于-100，公里每秒。
So it is this component, v cosine theta - which we call the radial velocity-- that is minus 100 kilometers per second.
探测器以每秒15公里（9英里）的速度通过小行星时，最近距其只有3160公里（1950英里），而整个飞越仅耗时不到一分钟。
The spacecraft passed the asteroid at a minimum distance of 3, 160 kilometers (1, 950 miles) and at a velocity of 15 kilometers (9 miles) per second, completing the flyby in just a minute.
探测器以每秒15公里(9英里)的速度通过小行星时，最近距其只有3160公里(1950英里)，而整个飞越仅耗时不到一分钟。
The spacecraft passed the asteroid at a minimum distance of 3,160 kilometers (1,950 miles) and at a velocity of 15 kilometers (9 miles) per second, completing the flyby in just a minute.
用这个办法，研究人员能通过50公里长的光纤每秒发送26t的数据。
Using that method, they were able to send data over a 50-kilometer length of optical fiber at 26 terabits per second.
与上述提到的设计不同之处在于，他们的设计不依赖利用太阳光，而是利用太阳风中的等离子流(每秒310英里/500公里)作为助推动力。
Instead of relying on sunlight, it would use the solar wind's plasma (which travels at 310 miles, or 500 kilometers, per second) as its means of propulsion.
这架名为“智能1号”的探测飞船的撞月速度为每秒2公里。按照此速度，这次撞击预计会在月球表面留下一个直径3米、深10米的坑，而且会在月面激起几公里高的尘埃。
Hitting at 2 kilometers per second, the impact of the SMART-1 spacecraft was expected to leave a 3-meter-by-10-meter crater and send dust kilometers above the surface.
脉冲星是已经死亡的小型中子星，直径只有20公里(12.4英里)左右，每秒旋转数百次，同时还会向外发出无线电光束。
Pulsars are tiny, dead neutron stars that are only around 20 kilometers (12.4 miles) in diameter and spin hundreds of times a second, emitting beam of radiation.
我说把地球看成一个每秒飞行500公里的飞船。
I say look at earth as a spaceship travelling at 500km a second.
这些卫星位于地球上方3.588万公里，运行速度为每秒3.07公里，而阿波菲斯行星则预计将在距离地球3.25万公里的地方经过。
Those satellites travel at 3.07 kilometres a second (1.9 miles), at up to 35,880 kilometres above earth -- and the Apophis asteroid will pass by earth at a distance of 32,500 kilometres.
光速比声速要快，为每秒钟30万公里。
Light travels faster than sound at the speed of 300,000 kilometres per second.
人所能使出的最大，速度是10公里每小时，不出意外的话，大概是4米每秒。
And the maximum speed that the person could use is at most ten miles per hour without killing him or herself which is about four meters per second.
地震开始于一个点，然后断裂会沿着断层继续下去，大约每秒2公里。
It starts at a point and then the rupture propagates along the fault at around 2 kilometers or so per second.
赢得奖金的标准是，设计者的机械必须能够全程攀上长达一公里的轨道，同时平均速度不能低于每秒5米（16英尺）。
To win the competition, a vehicle has to climb all the way up the kilometre-long cable, travelling at an average speed of five meters (16 feet) per second.
这颗彗星尘埃以每秒60多公里的速度闯入地球大气层，在大约100公里的高空开始产生肉眼可见的光迹。
The comet dust is vaporized as it enters the atmosphere at upwards of 60 kilometers per second, producing visible trails that begin at altitudes of around 100 kilometers.
发光的彗星尘埃颗粒正以每秒60公里的密集的气氛中约100公里以上的地球表面。
The glowing comet dust grains are traveling at about 60 kilometers per second through the denser atmosphere around 100 kilometers above Earth's surface.
当地震发生，它会从震源产生一个速度为数公里每秒的扩散的波。
When an earthquake occurs, it generates an expanding wavefront from the earthquake hypocenter at a speed of several kilometers per second.
扩充的比率是几乎每秒一个公里。
飓风f。着陆时达五级，并伴有强降雨，最大持续风速达260公里每秒。
Hurricane F. made landfall as a category five storm with heavy rain fall and maximum sustained winds of 260 kilometers per hour.
假如小行星撞击地球，它们的平均撞击速度将达到30公里每秒。
If an asteroid hit Earth, it's average speed would be 30kilometers per second.
电磁发射器推力能把弹丸加速到每秒几公里的速度，使其具有巨大的动能和极强的毁伤能力。
Electromagnetic emitter can give the projectile a velocity of several kilometers per second and makes the projectile have tremendous kinetic energy and weapon power.
电磁发射器推力能把弹丸加速到每秒几公里的速度，使其具有巨大的动能和极强的毁伤能力。
Electromagnetic emitter can give the projectile a velocity of several kilometers per second and makes the projectile have tremendous kinetic energy and weapon power.
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