As the cost of getting your own satellite in orbit drops sharply, the risks of irresponsible use grow.
随着将自己的卫星送入轨道的成本大幅下降，不负责任使用卫星的风险也随之增加。
However, as the cost of getting your own satellite in orbit drops sharply, the risks of irresponsible use grow.
然而，随着将自己的卫星送入轨道的成本大幅下降，不负责任使用卫星的风险也在增加。
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。
It might seem surprising to think about an item staying in space for that long, but the oldest satellite still in orbit—Vanguard 1—turned 60 in 2018.
想到一件物品在太空中停留那么久似乎令人惊讶，但目前仍在轨道上的最古老的卫星——先锋1号——在2018已年满60岁。
For instance, a research group here at Arizona State University recently claimed their developmental small Cube Sats could cost as little as $3,000 to put in orbit.
例如，亚利桑那州立大学的一个研究小组最近声称，他们开发的小型立方体卫星进入轨道的成本可能只有3000美元。
Because the moon's body blocks direct radio communication with a probe, China first had to put a satellite in orbit above the moon in a spot where it could send signals to the spacecraft and to Earth.
由于月球阻碍了与探测器的直接无线电通信，中国首先必须把一颗人造卫星送入月球轨道上的一个点，人造卫星可以从那里向航天器和地球发射信号。
For instance, a research group here at Arizona State University recently claimed their developmental small CubeSats could cost as little as $3,000 to put in orbit.
例如，亚利桑那州立大学的一个研究小组最近称，只需3000美元就能把他们开发的小型立方体卫星送入轨道。
But in orbit around Saturn, Cassini had no such problems.
但是在环绕土星的轨道上，卡西尼就没有这样的问题。
Out of that pops its velocity in orbit and out of it pops its radius.
然后是轨道上的速度,然后是半径。
So we also know how long it takes for the object to go around in orbit.
所以我们算一下，绕这个轨道一圈，要多长时间。
Objects in orbit are catalogued periodically rather than tracked continuously.
在轨目标总是定期编目而不是连续跟踪。
Now I wonder, what is the kinetic energy of the Earth in orbit around the sun?
我想知道地球绕太阳，公转的动能是多少？
As of 2007, three extrasolar planets have been confirmed in orbit around this pulsar.
直至2007年，在这颗脉冲星周围轨道上已有三颗系外行星被确认。
To stay in orbit, an object must be traveling at a constant speed over Earth's surface.
要留在轨道上，一个物体必须以恒定的速度运行于地球表面。
Today almost 900 of the things are in orbit around Earth, operated by more than 40 countries.
如今有40多个国家的近900个人工天体在地球轨道上运行。
The Moon is in orbit around the Earth at an approximate distance of 377, 000 km (234, 000 miles).
月亮所运行的轨道距离地球约为377,000公里（234,,000英里）。
The Mars Reconnaissance Orbiter is NASA's most powerful spacecraft currently in orbit around Mars.
目前在火星轨道上运行的火星勘测轨道飞行器是NASA最强大的航天器。
The shuttles have been called down from the starship in orbit, and are being used as troop carriers.
航天飞机从飞船轨道中被调下来当作运兵车使用。
Space probes parked in orbit round the sun might lie dormant yet intact for an immense period of time.
停在太阳周围轨道的太空探测器也许依然完好。
This is the kinetic energy for something in orbit at this radius, and this is the potential energy.
这是在轨道内这个，半径的物体的动能，这是势能。
The shuttle Discovery is, at this moment, in orbit; Endeavour and Atlantis each has one more flight.
发现号航天飞机现在正在地球轨道上，奋进号和亚特兰蒂斯号还有一次飞行任务。
The last team to visit that U.S. stationset a world record at the time for longest stay in orbit, 84 days.
最后一批进入美国空间站的宇航员创造了一项最长在轨时间（84天）的世界纪录。
Human digestion works pretty much the same in orbit as well, except that stomach contents float a bit high.
人类的消化系统在轨道上也没什么变化，除了胃里的东西会飘得高一点。
So we have around 300 different foods and beverages in orbit at the ISS that the crew members can choose from.
因此我们在轨道上的国际空间站里大约有300种不同的食品和饮料可供宇航员选择。
The release of this stunning vista celebrates the 21st anniversary of the Hubble Space Telescope in orbit.
这张震撼人心的远景图是在庆祝哈勃太空望远镜入轨21周年时发表的。
The ability to rendezvous in orbit could be used to help clear out space junk or inspect or fix satellites.
轨道相会技术可以被用作清理太空垃圾或是卫星修理。
The Shenzhou docking missions are seen as key milestones along the path to building a space station in orbit.
神舟对接任务被视作建设在轨空间站道路上的一座关键里程碑。
This artist's animation illustrates a massive asteroid belt in orbit around a star the same age and size as our Sun.
从这个艺术化的图片可以看到在围绕一个和太阳年龄和大小相当的恒星轨道上有一个巨大的小行星带。
This artist's animation illustrates a massive asteroid belt in orbit around a star the same age and size as our Sun.
从这个艺术化的图片可以看到在围绕一个和太阳年龄和大小相当的恒星轨道上有一个巨大的小行星带。
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