In 1664 Hooke observed a reddish spot on the surface of the planet.
1664年，胡克观察到了那颗行星表面的一个微红的斑点。
We are reproducing ourselves at such a rate that our numbers threaten the ecology of the planet.
我们繁衍得如此之快，以至于人口数量威胁到地球的生态系统。
Is there a core in the planet?
这个星球有核心吗？
Forget Gaia, save a marsh; forget the planet, save a frog.
忘记地球，去拯救一片湿地；忘记行星，去拯救一只青蛙。
This would change the geography of the planet considerably.
这将大大改变地球的地形。
Scientists think there was probably water on the planet long ago.
科学家们认为很久以前在那个行星上可能有水存在。
That may sound like a description of every teenager on the planet.
这听起来可能像是对这个星球上每个青少年的描述。
For seven million years they lived on the planet as part of nature.
七百万年来，他们作为大自然的一部分在这个星球上生活。
The planet was practically covered in ice just a few thousand years ago.
几千年前，地球几乎全部被冰覆盖。
It was about 6, 500 kilometers long and went across one fourth of the planet.
它大约有6500公里长，覆盖了地球的四分之一。
Of course, that may sound like a description of every teenager on the planet.
当然，这听起来可能像是对这个星球上每个青少年的描述。
In reality, sea level varies according to the irregular interior of the planet.
事实上，海平面会根据地球不规则的内部而变化。
Additionally, the gears also moved to match the motions of the planet and predicted eclipses.
此外，齿轮也会根据与行星运动的匹配和日食预测而移动。
You see how this epicycle theory could account for the seemingly backward motion of the planet.
你可以看到这个本轮理论是如何解释行星看起来像在做反向运动的。
In Earth's early days, all over the planet countless photosynthetic bacteria performed photosynthesis.
在地球早期，整个星球上有无数的光合细菌在进行光合作用。
The planet Jupiter may have no solid surface at all.
木星表面可能根本就不是固体的。
Scientists are studying photographs of the planet for signs of life.
科学家仔细察看行星照片，寻找生命迹象。
The gases that may be warming the planet will have their main effect many years hence.
这些可能正在使行星变暖的气体，其重要影响将在许多年之后显现。
The planet is one of 119 known extra-solar planets, objects that orbit stars other than the sun.
这是119颗太阳系外行星中的一颗。这些行星围绕除太阳外的其他星体运行。
It went across one-fourth of the planet.
它跨过了地球的四分之一。
It is helpful to both people and the planet.
它对人类和地球都有帮助。
That's not so good for you, or for the planet.
这对你或者地球都不是好事。
One day, a little boy was walking on the planet.
有一天，一个小男孩在这个星球上行走。
Why are they so unevenly spread across the planet?
为什么它们在地球上分布得如此不均匀？
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