The rocket launched two communications satellites.
火箭发射了两颗通信卫星。
Clearly, satellites are not just for rocket scientists anymore.
显然，卫星不再只是火箭科学家的专利了。
They can disable communications satellites and shut down power systems.
它们能使通信卫星失效并关闭电力系统。
Yet as LEO opens up to more amateur satellites, they may pose an increasing threat.
然而，随着LEO向更多业余卫星开放，它们可能构成越来越大的威胁。
Satellites used to be the exclusive playthings of rich governments and wealthy corporations.
卫星曾经是富有的政府和大公司的专属玩物。
The three are all optical satellites, which can capture images in daylight and in clear weather.
这三颗卫星均为光学卫星，它们可以在白天和良好天气下抓拍图像。
It includes plans for breaking up satellites into smaller components that communicate wirelessly.
该计划包括将卫星分解成更小的无线通信组件。
Over the past few decades a unique class of satellites has been created that fits the bill: CubeSats.
在过去的几十年里，一种独特的卫星应运而生：立方体卫星。
Today's vessels can find their prey using satellites and sonar, which were not available 50 years ago.
今天的船只可以利用卫星和声纳来寻找猎物，而这在50年前是不可能的。
The two sides signed many other agreements covering Brazilian port construction, and the joint launch of two satellites.
双方还签署了许多其他协议，包括巴西港口建设和两颗卫星的联合发射。
The large satellites interfere more seriously with telescope observations because of the strong reflections they produce.
由于大型卫星产生的强烈反射，它们对望远镜观测的干扰更为严重。
Galileo's observations of Jupiter's satellites showed that the Ptolemaic theory of the motion of celestial bodies is false.
伽利略对木星卫星的观察表明，托勒密关于天体运动的理论是错误的。
As an organization of volunteers, AMSAT was putting "amateur" satellites in orbit decades before the current CubeSat craze.
作为一个志愿者组织，国际业余卫星组织在当前立方体卫星热潮之前的几十年前就在将“业余”卫星送入轨道。
As an organization of volunteers, AMSAT was putting "amateur" satellites in orbit decades before the current Cube Sat craze.
作为一个志愿者组织，业余卫星组织将“业余”卫星送入轨道的时间比现在的立方体卫星热潮早了几十年。
If the ground stations tracking the satellites are not accurate to the millimeter, then the satellites cannot be accurate either.
如果跟踪卫星的地面站位置不能精确到毫米，那么卫星也是不可能精确的。
The shuttle and space-station crews will perform several experiments, including testing technology to refuel satellites robotically.
航天飞机以及空间站上的人员将执行多个实验，包括测试用机器人给卫星补充燃料的技术。
Eleven point two kilometers per second, at which satellites can be freed from the gravitation of the earth, is called "escape speed".
卫星以11.2千米每秒的速度前进可以脱离地球引力，这被称为“逃逸速度”。
Some of the answers may come from a nonprofit organization that has been building and launching amateur satellites for nearly 50 years.
一个已经建造和发射业余卫星近50年的非营利组织可能可以给出其中一些答案。
Two or more satellites slamming into each other could create many more out-of-control bits that would pose even more hazards to the growing collection of satellites in space.
两颗或两颗以上的卫星相撞可能会造成更多的失控碎片，从而对太空中日益增多的卫星构成更大的威胁。
The department will make sure that newly launched satellites don't use radio frequencies that would interfere with existing satellites,and schedule when such new satellites can be launched.
该部门将确保新发射的卫星不使用会干扰现有卫星的无线电频率，并将安排新卫星的发射时间。
The department will make sure that newly launched satellites don't use radio frequencies that would interfere with existing satellites, and schedule when such new satellites can be launched.
该部门将确保新发射的卫星使用的无线电频率不会干扰现有卫星，并计划何时发射此类新卫星。
Have you ever heard of satellites?
你听说过卫星吗？
These satellites fly around the earth.
这些卫星绕地球飞行。
How do satellites stay up without falling down?
卫星是如何不坠落的呢？
How do satellites stay up without falling down?
卫星是如何不坠落的呢？
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