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。

youdao

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。

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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。

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Some scientists have called Jupiter the protector of the inner planets and our own Earth -- from objects from the outer solar system.

VOA: special.2009.08.25

Mr.Lissauer says the five inner planets are among the smallest confirmed planets beyond our solar system.

VOA: special.2011.02.09

Such asteroids would rapidly have adopted orbits that cut across those of the inner planets, including Earth.

ECONOMIST: Asteroid impacts

And the hole's outer edge is roughly where rocky planets, like the inner planets of this solar system (including the earth), are expected to be.

ECONOMIST: Dusty genesis

Small planets, like the inner four in our own solar system, are rocky - larger ones, like the outer four, aren't much more than balls of gas.

BBC: Viewpoint: The obsession with a 'twin Earth'