But a small planet also had drawbacks.

但是小行星也有不好的地方。

We live on a small planet called Earth.

而我们住在一个名为地球的小行星上。

The smallest planet with the second hottest degree.

最小的行星，温度第二高。

But those are not small planets like Earth.

不过那些都不是像地球这样的小行星。

And the second smallest planet in our solar system.

也是我们太阳系第二小的行星。

So we can move down to smaller and smaller and cooler planets.

所以我们可以去研究更小更冷的行星。

I was just a young girl from a small planet and I felt very unimportant here.

我只是个小行星上来的小姑娘，在这儿我觉得很卑微。

Well, mercury is the smallest planet in our solar system and also the closest to the Sun.

水星是太阳系中最小的行星，也是离太阳最近的行星。

Many, though, are pieces of small planets that bashed into each other over the past few billion years.

但仍有很多是过去几十亿年里小行星相互碰撞产生的碎片。

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。

Mercury, one of the smallest planets, would have been expected to be really frozen all the way through.

水星, 最小的行星之一, 将真的全部冻结。

It's thought to have formed when a small planet impacted Earth at a grazing angle billions of years ago.

人们普遍认为它是在数十亿年前一颗小行星以掠角撞击地球时所形成的。

Dawn will gather information about Ceres until the middle of 2016. It will then continue to orbit the small planet.

到2016年中旬，曙光号飞船将会收集有关谷神星的信息。然后它会继续环绕这颗小星球运行。

For example, Mercury is the smallest planet.

例如，水星是最小的行星。

Sophie knew that the world was only a small planet in space.

索菲知道， 世界只是太空中的一颗小行星。

And around 500 smaller planets collided with each other to form the inner planets we know today, including your home, Earth.

大约500颗较小的行星相互碰撞，形成了我们今天的内行星，包括我们的家，地球。

It's big compared to Earth, and is thought to have formed when a small planet impacted Earth at a grazing angle.

它相对地球来说很大，被认为是由一颗小行星切线撞击地球时产生的。

Let's say this is some big star, and this is some smaller planet orbiting that star.

假设这是某颗大恒星，而这是围绕该恒星运行的较小行星。

It's the smallest planet in the solar system and the sun is by far the largest object.

它是太阳系中最小的行星，而太阳是迄今为止最大的天体。

Iron and rock make up most of the four smaller inner planets of our solar system.

铁和岩石构成了我们太阳系四颗较小的内行星的大部分。