Messenger of the gods is what mercury means.

水星意思是上帝信使。

Now Mercury has quite a complex orbit.

水星公转有点复杂。

It orbits the Sun once every 88 days.

水星公转周期是88天。

Mercury's nearness to the sun makes it an especially difficult planet to study.

水星离太阳很近，这让水星研究难度很高。

This means a year on Mercury is shorter than a day on the planet.

导致水星一天比一年要短。

That first image ever acquired from orbit around Mercury was amazing.

从环绕水星上获得第一张图像令人惊。

But you can calculate Mercury's orbit very precisely using only Newton's laws of gravity.

但是，只要用牛顿定律我们就能精确地算出水星。

The only other spacecraft to visit Mercury was NASA's Mariner 10, which flew past the planet in the mid-1970s.

另外一个访问过水星航天器是NASA麦仑娜10号。它是上世纪70年中期经过水星。

Next, we are checking out a time-lapse tour of the planet Mercury like we've never seen before.

接下来，我们要看看水星延时之旅，这是我们从未见过。

Dipping below the surface, we can only infer what Mercury's internal structure is like.

表面之下，我们只能对水星内部结构进行推测。

This pioneering voyage has led to a completely new idea of how Mercury may have formed.

这次开创性航行让我们对水星形成过程有了全新认识。

It's the second smallest planet after Mercury yet has the largest volcano in the Solar System, Olympus Mons.

它是仅次于水星第二小行星，但有太阳系中最大火山奥林帕斯山。

The Mercury 7 prototype has arrived for testing.

水星计划模拟雏形机到了 预备开始测试。

We're finding planets bigger than Jupiter, smaller than mercury.

我们找到了比木星大，比水星小行星。

A clue to understanding these strange features was found in Mercury's chemistry.

人们在水星化学成分中发现了理解这些奇怪特征线索。

Well, the hill sphere for Mercury about 175000 km, which is much smaller than the hill spears of other planets.

水星山球大约175000千米，比其他行星山矛要小得多。

There is intense gravitational pull from the sun, as well as extreme solar radiation.

太阳对水星作用很大，此外太阳辐射也很高。

Remember earlier, when I said Mercury's orbit is highly elliptical?

还记得之前我说过水星非常扁长吗？

But 150 years ago, astronomers noticed something strange about Mercury's orbit.

但在 150 年前，天文学家发现水星运行有点奇怪。

In 14 days the Mercury 7 will be here for training.

最多再过14天 水星计划7名成员就要来受训了。