But, unlike the cores of the inner planets, the Moon's core contains little or no iron, while the typical planet-forming materials were quite rich in iron.
但是，与内行星的核心不同，月球的核心几乎不含铁，而典型的行星形成物质则富含铁。
Also, because of their relative locations, the four Jovian planets are known as the outer planets, while the terrestrial planets are known as the inner planets.
同样，由于它们的相对位置，四颗类木行星被称为外行星，而类地行星被称为内行星。
Earth is the only one of the inner planets with a large satellite, the orbit of which is neither in the equatorial plane of Earth nor in the plane in which the other planets lie.
地球是内行星中唯一一个有大卫星的，它的轨道既不在地球的赤道平面上，也不在其他行星所在的平面上。
As a result, some 5 billion years from now, the sun will engulf the inner planets, Mercury and Venus.
因此，大约在50亿年之后，太阳将会吞没近围的行星——水星和金星。
One explanation is that HIP 13044 swallowed its inner planets during the red giant phase, which would make the star spin more quickly.
一种解释是HIP 13044在红巨星阶段吞噬了它的一些带内行星，这可能使它自转得更快。
When it does, the sun will expand to engulf the inner planets and possibly Earth.
一旦变成红巨星的时候，太阳将会膨胀并吞没内围的行星，也许包括地球在内。
The belt formed some 4.5 billion years ago around the same time and under similar conditions as Earth and the inner planets.
小行星带大约于45亿年前形成，彼时，地球和类地行星也在相似的条件下日渐成型。
A number have orbits that take them closer into the solar system that sometimes lead them to collide with Earth or the other inner planets.
有很多小行星的轨道可以把它们带到太阳系的更内层，有时甚至会使它们与地球或其它内行星相撞。
It's all in service to the question: What does this oddball planet tell us about how the solar system, especially the rocky inner planets, evolved?
所有涉及这项任务的人员都想问这样的问题：在关于太阳系，特别是内部为岩石的行星，是如何形成的这个问题上，这个古怪的星球将告诉我们什么呢？
The planet Mercury is the smallest of the inner planets (4, 880 km/3, 032 mi in diameter), and the closest to the Sun (58 million km/36 million mi - or 3.2 light minutes).
水星在地内行星中是最小的行星（直径4 880公里），同时也是靠太阳最近的行星（5800万公里）。
Now, the team has shown how in a small proportion of cases these fluctuations can grow until after several million years, the orbits of the inner planets begin to overlap.
现在，该小组展示了这些轨迹变动在少数情况下会如何加大，几百万年后，内侧行星的轨道如何开始重叠。
Or so say scientists who, after examining solar wind samples collected by the Genesis spacecraft, conclude that the inner planets of our solar system formed a little differently than we’d thought.
但是，科学家对“创世纪”航天器收集的太阳风样品进行检测后发现，太阳系内地行星的形成过程与当初的设想存在不同。
Or so say scientists who, after examining solar wind samples collected by the Genesis spacecraft, conclude that the inner planets of our solar system formed a little differently than we'd thought.
检查了创世纪号太空船收集的太阳风样品之后，科学家们发现太阳系内行星的形成和人们之前想的不大一样。
Or so say scientists who, after examining solar wind samples collected by the Genesis spacecraft, conclude that the inner planets of our solar system formed a little differently than we'd thought.
检查了创世纪号太空船收集的太阳风样品之后，科学家们发现太阳系内行星的形成和人们之前想的不大一样。
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