Rock on a planet is also important.
行星上的岩石也很重要。
It was way too faint to be a planet.
它太暗了，不可能是行星。
It is a planet that could support life.
这是一颗可以维持生命的行星。
冥王星该不该是颗行星？
Officially, Pluto is still not a planet.
按照官方说法，冥王星仍然算不上一颗行星。
But how would we find such a planet?
但是，我们如何才能找到这样一颗行星呢？
That of a laboratory or that of a planet?
是实验室级别的还是全球性的？
They've decided that Pluto is not a planet anymore!
他们决定取消冥王星的行星资格了。
Sales of "Pluto is a Planet" T-shirts are high.
印有“冥王星是一颗行星”字样的T恤衫正在热卖。
It's a planet. It's Venus, if I recall correctly.
它只是颗行星，金星，我没记错的话。
The 4th planet, G, is a planet that could sustain life.
有可能维持生命存在的Gliese 581g为第四颗行星。
Could a planet have a moon that itself had a smaller moon?
行星能有一个自身带有一个更小卫星的卫星吗？
But WD 0806-661 B is not a planet - it's a very small star.
但是WD 0806- 661B号星球并不是一颗行星——而是一颗非常小的恒星。
"Many people think it's special to be a planet," Stern said.
“很多人认为行星很特殊。”Stern说。
No wonder we're looking so hard for a planet more like Earth.
所以我们才那么努力的寻找类似地球的行星。
We should not measure the wealth of a planet by its cash flow.
我们不应该以现金流来衡量一个星球的财富。
The life forms most likely to develop on a planet would be bacteria.
行星上最容易生存下来的是细菌。
Good luck trying to make a planet, much less a person, out of that.
这些元素造个行星都全得靠运气，更别说人了。
This artist's concept shows the smallest star known to host a planet.
这张艺术概念画展示了已知最小的拥有行星的恒星。
I find it uncanny that they seem to have an atmosphere just like a planet.
我发现这非常奇怪，它们就好像行星一样拥有大气层。
FOR a planet named after the goddess of love, Venus is something of a misfit.
作为一个以爱神的名字命名的行星，金星有些名不副实。
So it's imperative that we, as citizens of a planet, understand each other.
因此，作为这个星球的公民，我们迫切需要互相了解。
Jesse: Yeah, in his textbooks, Pluto was still a planet. It's not any more.
杰西：是啊，在他的课本里，冥王星还是一颗行星呢。现在却不是了。
There is, however, a planet known to orbit backwards around its parent star.
然而，还有一颗绕着母星逆行的行星。
Jesse: : Yeah, in his textbooks, Pluto was still a planet. It's not any more.
杰西：是啊，在他的课本里，冥王星还是一颗行星呢。现在却不是了。远。
This is the first image ever taken of Earth from the surface of a planet beyond the Moon.
这是除月球之外，第一个从其它星球的陆地上拍摄地球的照片。
This is the first image ever taken of Earth from the surface of a planet beyond the Moon.
这是除月球之外，第一个从其它星球的陆地上拍摄地球的照片。
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