Messenger of the gods is what mercury means.

水星的意思是上帝的信使。

Now Mercury has quite a complex orbit.

水星的公转轨道有点复杂。

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

水星的一天比一年要短。

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

水星离太阳很近，这让水星的研究难度很高。

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

人们在水星的化学成分中发现了理解这些奇怪特征的线索。

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

另外一访问过水星的航天器是NASA的麦仑娜10号。它是上世纪70年中期经过水星的。

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

但在 150 年前，天文学家发现水星的运行轨道有点奇怪。

What Messenger discovered about Mercury could suggest a new twist in the story of the Solar system.

信使号对水星的发现可太阳系的故事带来新的转折。

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

它是仅次于水星的第二小行星，但有太阳系中最大的火山奥林帕斯山。

The Mercury 7 prototype has arrived for testing.

水星计划的模拟雏形机到了 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，比水星小的行星。

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

水星的山球大约175000千米，比其他行星的山矛要小得多。

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

但是，只要用牛顿的引力定律我们就精确地算出水星的轨道。

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

太阳对水星的引力作用很大，此外太阳辐射也很高。

This is able to explain Mercury's erratic orbit.

这样就纠正水星轨道的错误计算了。

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

最多再过14天 水星计划的7名成员就要来受训了。

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

从环绕水星的轨道上获得的第一张图像令人惊叹。

So why are Mercury in Venus bereft of moons?

那么为什么金星上的水星没有卫星呢？

We could also terraform parts of Mercury.

我们还可以对水星的某些部分进行改造。

ESA's Bepi probe will operate in Mercury's inner orbit. JAXA's Mio will be in the outer orbit.

ESA的Bepi探测器将在水星的内层轨道上运行。JAXA的Mio将在外层轨道上运行。