Second, Jupiter's enormous mass prevents most Sun-bound comets from penetrating the inner solar system.
其次，木星的巨大质量阻止了大多数与太阳结合的彗星穿透太阳系内部。
Paradoxically, while the temperatures required for liquid water exist only in the inner solar system, the key building blocks of life, including water itself, occur primarily beyond the asteroid belt.
矛盾的是，虽然液态水所需的温度只存在于太阳系内部，但生命的关键组成部分，包括水本身，却主要存在于小行星带之外。
"It may require a whole new look at the inner solar system," he said.
“可能需要对内太阳系进行全新审视。”他说。
The trip has taken so long because exploring the inner solar system is a tricky business.
此行花了这么长的时间是因为探索太阳系内部是一件棘手的事。
The Moon has had a tilted orbit since 2004, after Planet X came into the inner solar system in 2003.
行星X于2003年进入了内太阳系之后，自从2004年以来月球的轨道就倾斜了。
In order to enter orbit at Mercury, MESSENGER is traveling on a long, looping tour of the inner solar system.
为了进入水星轨道，“信使”号在内太阳系沿漫长、往复的路线旅行。
Planet X is in the inner solar system, standing between the Earth and Sun, and warping the Earth's magnetosphere.
行星x在内太阳系中，位于地球和太阳之间，并使地球的磁气圈变形。
Now we see the inner solar system. The green arc is traversed by planet Earth during some six weeks each Septembers and October.
图中的绿色弧线就是地球的一段轨道。每年九月和十月的六个星期时间里，地球会经过这段轨道。(真巧，我们现在正在这一区域。)
The Messenger began its trip through the inner solar system six and a half years ago, and it entered orbit around Mercury on March 18.
“信使”号探测器在六年半前开始了它的太阳系之旅，直到今年三月十八日才进入水星轨道。
The Second Sun made dramatic appearances in 2003 when Planet X first arrived in the inner solar system, as the location was just right.
第二个太阳在X星2003年进入内太阳系时就引人注目地登场了，位置刚刚好。
They claimed the Hubble had observed asteroid collisions, creating tails for the asteroids, and all this within the inner solar system.
他们声称哈勃太空望远镜已经观察到了“小行星相撞”，造成了小行星带上了尾巴，而且这些事情都发生在内太阳系中。
These are a few examples that have given NASA fits, as they are tasked with denying the presence of Planet X in the inner solar system.
这儿有几个例子已经让NASA大吃一惊了，因为他们的任务就是否认X行星在内太阳系的存在。
Moons are rare in the inner solar system: Venus and Mercury don't have any, and Mars's two moons are tiny pebbles in comparison with ours.
在太阳系内的行星拥有的卫星是很少的，金星和水星没有卫星，火星有两颗卫星，但跟我们的比起来就像是小小的鹅卵石。
Prof Napier says a comet swooped into the inner solar system between 20, 000 and 30, 000 years ago and has been breaking apart ever since.
内皮尔教授说，在2万至3万年前，一颗彗星突然冲进太阳系内部，并且从那时起就一直被瓦解。
Messenger was launched more than six years ago, travelling through the inner solar system and embarking on flybys of Earth, Venus and Mercury.
信使号于六年前发射，穿过太阳系内部，飞越地球、金星和水星。
After reaching about half of the Earth-Sun distance from the Sun, the comet should fade rapidly as it then heads out of the inner Solar System.
到达距太阳半个日地距离之后，彗星会因朝着内太阳系之外急速前进而快速变暗。
Astrophysicists John Matese and Daniel Whitmire analyzed comets passing through the inner solar system, discovering many of them had strange orbits.
天体物理学家约翰·马特斯和丹尼尔·惠特米尔分析了太阳系内部的彗星运转，发现许多彗星的运行轨道都非常奇特。
The spacecraft began its journey more than six years ago, traveling through the inner solar system and embarking on flybys of Earth, Venus and Mercury.
该航天器与六年前启程航向内太阳系，并对地球、金星和水星从事飞近探测。
Will the new WISE probe, just launched and due to map the skies in infrared, now "discover" Planet X sitting right next to us in the inner solar system.
是不是新发射的在红外频域扫描天空的WISE探测器现在将“发现”X行星正位于内太阳系里我们的身畔？
Most scientists think the moon was born when a huge object roaming the inner solar system - something about the size of Mars - smashed into the embryonic Earth.
大部分科学家认为月球在一块徘徊在太阳系内，大小几近火星的巨型物体撞击原始地球后产生。
If water is created in this way, it could happen on all airless planets throughout the inner Solar System that have oxygen-rich rocks scattered on their surfaces.
如果水是以这种方式生成的话，那么在整个太阳系内部所有无空气但表面上存在富含氧的矿物的行星上，都可能生成水。
Unbeknownst to most of us, a small but vocal group of conspiracy theorists is convinced that a rogue planet is about to enter the inner solar system and doom the Earth.
不知情的我们大多数人来说，虽小，但声带集团阴谋理论家相信，一个无赖地球即将进入太阳系内部和毁灭地球。
And study of the pictures produced by this year's Lunar Reconnaissance Orbiter will allow scientists to build a history of asteroid bombardment of the inner solar system.
而今年对月亮观测卫星拍到的图像的研究允许科学家们描绘出太阳系内小行星爆炸的历史痕迹。
Most have at least heard the rumors about a rogue planet in the inner solar system and many have been frankly informed about the cover-up and the need for their cooperation.
他们中的大多数至少听说了关于内太阳系存在的流氓行星的流言，并且很多人被坦白地告知掩盖活动需要他们的合作。
In the solar system, the theories say that this is large asteroid to lunar size in the inner solar system, and one to fifteen times the Earth's size in the outer solar system.
理论上，在太阳系的内太阳系(inner solar system)中存在一个和月亮一样大的小行星，在外太阳系(outer solar system)还有个15倍地球大小的小行星。
In the solar system, the theories say that this is large asteroid to lunar size in the inner solar system, and one to fifteen times the Earth's size in the outer solar system.
理论上，在太阳系的内太阳系(inner solar system)中存在一个和月亮一样大的小行星，在外太阳系(outer solar system)还有个15倍地球大小的小行星。
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