Light travels at about 300, 000 kilometers per second (186, 000 miles per second) — that's pretty fast.
光速大约为每秒300,000公里(即每秒186,000英里)——非常之快。
The escape velocity needed by a spacecraft to overcome the tug of Earth’s gravity is around seven miles per second—ie, Mach 34.
宇宙飞船克服地球引力所需的逃逸速度约为每秒7英里（也即34马赫）；
Claims that it's possible to push light beyond 186, 000 miles per second (300 million meters per second), are equally illusory, Galison said.
声称可能把光速增加到超过每秒186,000英里(每秒300,000千米)，同样也是虚幻的，盖利森说。
At that speed, HM Cancri is the fastest binary star pair ever discovered, with each White Dwarf circling the other at a speed of 310 miles per second.
双星HMCancri是迄今为止所发现的运行最快的双星，它们是一对白矮星，其中一个围绕着另一个运转的速度是每秒310英里。
According to Einstein's 1905 special theory of relativity, nothing is meant to be able to go faster than the speed of light — 186, 282 miles per second.
根据爱因斯坦1905年发表的相对论，任何物体的速度都不可能超越光速，即186282英里/秒。
It travels thousands of miles per second.
它一秒钟能走几千英里。
A rocket must attain a speed of about five miles per second so that it may put a satellite in orbit.
火箭必须获得每秒大约五英里的速度以便把卫星送入轨道。
Claims that it's possible to push light beyond 186,000 miles per second (300 million meters per second), are equally illusory, Galison said.
声称可能把光速增加到超过每秒186,000英里(每秒300,000千米)，同样也是虚幻的，盖利森说。
If scientists were to detect a 600-foot-wide asteroid ten years in advance, Yeomans says, it could be deflected with a two-ton projectile traveling six miles per second.
约曼斯说，如果科学家能提前10年探测到一颗600英尺直径的小行星，就可以使用一颗两吨重，每秒速度6英里的弹道飞行器使其偏离轨道。
NASA's Solar Dynamics Observatory said it saw a large coronal mass ejection (CME) associated with the flash blasting toward Earth at about 560 miles per second (900 kilometers per second).
美国国家航空和航天局的太阳力学天文观测台称，有一股强大的与耀斑引起的日冕物质抛射大约以每秒560英里（每秒900千米）的速度向地球袭来。
As a reasonable guess, they might, on an average, be 100 light years away. a light year is the distance which light travels at 186,000 miles per second in one year, namely 6 million million miles.
据合理推算，外星人离我们平均距离也有100光年之远(1光年是光以每秒186,000英里的速度在一年内走的距离即6万亿英里)。
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.
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。
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