Which planets can sustain life?
哪些行星可以维持生命的存在？
Does life exist on other planets?
其他行星上有生命吗？
Is there intelligent life on other planets?
在其他星球上存在具有智力的生命吗？
The theory supposes the existence of life on other planets.
这个理论假定其他行星存在生命。
All the planets orbit the Sun in roughly the same plane, around its equator.
所有行星基本在同一个平面上围绕太阳赤道运转。
Is it the distance of the planets from the Sun?
它是行星到太阳的距离吗？
There is a more violent theory about how planets form.
关于行星是如何形成的，还有一种更为激烈的理论。
If those planets are out there, we should be finding them pretty soon.
如果那里真有那些行星，我们应该很快就会找到它们。
When astronomers have found the star, they look at the planets around it.
当天文学家发现了这颗恒星，他们就会观察它周围的行星。
The most popular one is that they may contain visitors from other planets.
最常见的一种说法是它们可能包含来自其他行星的访客。
It would have been warm enough on these planets for liquid water to exist.
这些行星上的温度足够高，足以让液态水存在。
The most obvious difference between the terrestrial and the Jovian planets is their size.
类地行星和类木行星之间最明显的区别是它们的大小。
哪颗行星是蓝色的？
Certain planets will have true.
某些星球将拥有真正的。
行星绕着太阳旋转。
New planets are still being found.
新的行星正在不断被发现。
没有行星，就没有生命。
And why do the planets orbit the sun?
为什么行星绕着太阳转呢？
We know that that's not true for planets.
但我们知道，行星的情况不同。
How many planets are we dealing with here?
我们与这里多少行星有联系？
The Earth is only one of the numerous planets.
地球只是众多星球中的一个。
Don't blow it - good planets are hard to find.
别摧毁它——好的星球是很难找到的！
That is because these planets are composed of gas.
这是因为这些行星都由气体构成。
Some day we ourselves may travel to other planets.
也许某一天人类能够踏上其他星球的土地。
As the saying goes, good planets are hard to find.
常言道说，找到一个好的星球很难。
It must be the sun that is pulling on the planets.
毋庸置疑，是太阳拉着行星绕其旋转。
Kepler, by contrast, can find such planets easily.
相比之下，开普勒可以很容易地找到这样的行星。
How many other planets have taken a similar course?
有多少星球经历了类似的历程？
How many other planets have taken a similar course?
有多少星球经历了类似的历程？
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