太阳系最大行星内部都有什么？
地震学研究地震及行星内部的震动运动。
Seismology is the study of earthquakes and the movement of vibrations through the interior of the planet.
行星内部也许会达到可以使铁熔化的热度。
它测量温度，压力，化学成分，云的特点，阳光和行星内部的能量，以及闪电。
It measured temperature, pressure, chemical composition, cloud characteristics, sunlight and energy internal to the planet, and lightning.
木星云顶景观显示了由热对流造成的大气现象：对流将热量从行星内部转移至表面或更远的地方。
The atmospheric phenomena suggested by jovian cloud tops are caused by convection the transfer of heat from the interior of the planet to its surface and beyond.
相比之下在开普勒-10轨道中发现的那颗行星其轨道周长只有20小时，而且密度很高以至于研究员估计行星内部是由铁组成的。
The planet orbiting Kepler 10, by contrast, has an orbital period of a mere 20 hours and is so dense that it is probably made of iron.
巴特勒说：“这个星系内部有一堆岩石，有点像类地行星。”
"The galaxy has an inner clutch of rocky, sort of terrestrial-like planets," Butler says.
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。
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.
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。
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.
行星科学家长期以来也曾将金星的贫瘠归咎于缺乏一个内部磁场。
Planetary scientists have also long blamed Venus's sterility on the lack of an internal magnetic field.
行星胚胎被认为是足够大的物体，至少可以进行一些内部融合，于是，这些物体的内部就开始了形成层的过程。
Planetary embryos are thought of as bodies big enough to have undergone at least some internal melting, so that the interiors of these bodies have begun a process of forming layers.
研究人员还说，“我们并没有发现银河系最内部的行星是完全不适合居住的。”
'We do not find the inner Galaxy is entirely inhospitable to life,' says the study.
人们认为，液态的金属化氢可以存在于大质量行星，如木星、土星等的内部。
Liquid metallic hydrogen is thought to exist in the high-gravity interiors of Jupiter and Saturn.
太阳系内部行星的相对体积(拍自1 - r)：水星、金星、地球和火星。
Relative size of the inner planets of the solar system (from l-r) : Mercury, Venus, Earth, and Mars.
太阳系内部行星的相对体积(拍自1 - r)：水星、金星、地球和火星。
Relative size of the inner planets of the solar system (from l-r) : Mercury, Venus, Earth, and Mars. New research supports the idea that Mars owes its small size to its relatively rapid formation.
信使号自2004年发射升空以来已经三次掠过水星，最终计划在2011年3月进入太阳系最内部行星——水星的轨道。
MESSENGER has zipped right by Mercury three times since being launched in 2004, and is scheduled to enter orbit around the innermost planet in March of 2011.
许多陨石是由内部形成的小行星经过随后的撞击后打散的石头碎片。
Many meteorites are pieces of rock that formed inside small planets which were shattered by subsequent collisions.
这些小行星在横越其它内部行星后就会快速改变轨道，其中也包括地球。
Such asteroids would rapidly have adopted orbits that cut across those of the inner planets, including Earth.
这些物质,包括氨、二氧化碳、一氧化碳、钠时,让人吃惊的是,银,可能来自地球、月亮的内部,还是来自彗星和小行星。
The compounds, which include ammonia, carbon dioxide, carbon monoxide, sodium and, surprisingly, silver, could have come from the Earth, from the moon's interior, or from comets and asteroids.
因此，一个疏散星团很少能够存活到它内部的某个成员变成行星状星云。
Hence, it is rare that an open cluster survives long enough for one of its members to form a planetary nebula.
有些理论怀疑生命是否真的起源于地球，他们认为生命并非诞生于地球，而是来源于一个遥远的世界或是某颗陨落到地球上的彗星或小行星的内部。
Some question whether life began on Earth at all, asserting instead that it came from a distant world or the heart of a fallen comet or asteroid.
NGC2818是银河系中少数几个位于疏散星团内部的行星状星云之一。
NGC 2818 is one of very few planetary nebulae in our galaxy located within an open cluster.
什么时候某个NASA内部的人将要泄露一张行星X的清晰的照片？
When will someone from inside NASA is going to leak a clear photo of Planet X?
但是，在彗星从它们在行星盘的诞生地'前进'到奥尔特云的方式上，以及它们能返回太阳系内部的途径上，这颗星扮演着重要的角色。
But it would play a big role in the way comets' made their way 'from their birth places in the planetary disc out to the Oort Cloud and on now they can return to the inner solar system.
此外，对木星的研究表明，外层的气态巨行星能充当盾牌的作用，保护内部岩态行星——和行星上的任何生命形态——免遭频繁光顾的小行星撞击。
What's more, studies of Jupiter suggest that outer gas giants can act as gravitational shields, protecting inner rocky worlds-and any life-forms on them-from frequent asteroid impacts.
万有引力作用于恒星、行星和宇宙飞船内部和彼此之间。
Gravity ACTS within and between stars, planets and spacecrafts.
以这种方式测绘行星可以深入了解其内部结构，并为大洋环流和气候研究提供重要的参考数据。
Mapping a planet in this way provides insight into its internal structure, as well as vital reference data for ocean circulation and climate studies.
他的研究表明，现有大气中的大部分气体都来源于诸行星的内部。
His study showed that most of the present atmospheric gases originated in each planet's interior.
他的研究表明，现有大气中的大部分气体都来源于诸行星的内部。
His study showed that most of the present atmospheric gases originated in each planet's interior.
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