Of all the inner planets, only Mercury and Earth boast such a field.

在所有的内行星中，只有水星和地球拥有这样一个领域。

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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。

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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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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'