Today, Pluto is best known for losing its status as a planet.

今天冥王星最出名的，是他失去了行星的身份。

But actually, we have discovered a few new things about it in the last few years.

但實際上，在過去的幾年裡，我們有了關於它的幾項新發現。

The main one: it has more moons than we thought.

其中主要的一個：它比我們想像中有更多的衛星。

At least five, but there might be even more!

至少有五個，但有可能會更多！

Charon dominates the moons.

Charon 佔主導地位的衛星。

Because of its size and mass, it’s way more influential than the other four.

因為它的尺寸和質量遠比其他四個衛星更為巨大。

Charon is so massive in relation to Pluto

Charon 相比冥王星是如此龐大，

that the center of mass of the Pluto system is outside the dwarf planet.

以致他們使用共同的質心來進行公轉。

So the moons are not orbiting Pluto, but a point outside of it.

所以它可能並不是圍繞冥王星，而是與冥王星共享軌道。

This is unique in the Solar system,

這是太陽系唯一的例子。

and some scientists even categorize Pluto and Charon as a double system,

一些科學家甚至認為冥王星和冥衛一，是雙行星系統，

instead of a dwarf planet orbited by moons.

而不是單純的矮行星與衛星的運行軌道。

Charon is composed either of layers of ice and rock, or it’s a giant dirty iceball.

Charon 是由冰和岩石層組成，或者它 一個巨大的冰球臟。

If it weren’t orbiting Pluto, it would itself be a dwarf planet.

若不是圍繞冥王星，這本身將是一個獨立的矮行星。

But what about the other moons?

但對於其他的衛星？

Well, to be honest, we don’t know that much about them.

好了，說實話，我們不並沒有太多關於他們的資料。

Pluto is incredibly far away from Earth, so it's hard to get detailed information.

冥王星是那麼難以置信的遠離地球，所以很難得到詳細的信息。

But this will change soon.

但是，這一切將會很快的改變。

In 2015, the space probe New Horizons will

在2015年的太空探測器新地平線

reach the Pluto system after a 9-year journey

將到達冥王星，經過9年的旅程，

and finally give us detailed information about Pluto and its moon buddies.

他終於給關於冥王星及其衛星群的詳細信息。

Let’s throw in some infographics just for fun.

讓我們顯示一些信息圖表，只是為了樂趣而已。

This is Pluto and its moons to scale, including spaces between them.

這是冥王星和它的衛星的實際比例圖表，包括它們之間的空間。

This is the Pluto system,

這是冥王星系統，

and this is Jupiter.

這是木星。

It is bigger than the whole Pluto system.

它是遠大於整個冥王星系統。

Jupiter is big!

木星是很大的！

Okay, let’s wrap up.

讓我們做個總結。

So even if Pluto isn’t a planet,

因此，即使冥王星已經不是行星，

it’s still very interesting and worth exploring.

但它仍然是非常有趣和值得探討。

In 2015 we’ll know more.

在2015年，我們會知道更多。

If you can’t wait that long, watch the other Moon May videos.

如果你不能等那麼久，請先收看其他Moon May 的視頻。

Subtitles by the Amara.org community

繁體中文字幕: Sheldonng