The two spacecraft will link up in orbit.

两艘宇宙飞船将在轨道上对接。

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。

What about other big things still in orbit?

如果还有些大东西还在轨道上运行呢？

Q: What about other big things still in orbit?

问：如果还有些大东西还在轨道上运行呢？

The company already has two scaled-down versions in orbit.

比奇洛的公司已经有两个缩小版在轨道上运行。

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。

If you know r, then you can calculate the speed in orbit.

如果知道R，就能，计算轨道里的速度。

That the sandwich stands still, has no speed in orbit anymore.

意思是三明治不动，在轨道中没有速度。

The velocity of the Earth in orbit is about 30 kilometers per second.

地球在轨道里的速度，约为30千米每秒。

The earth is one of mine planets which move in orbit round the sun.

地球是沿轨道围绕太阳运行的九大行星之一。

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。

Well, suppose I want to look at something like an electron in orbit here.

假如我想看到，轨道上像电子一样的东西。

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？

In orbit around the Moon, the orbiter was about 372,335 kilometers from Earth.

环绕月球时，卫星距离地球约372,335公里。

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。