天文术语。水星、金星的绕日运行轨道在地球(asteroid belt)以内，称内行星。
[字幕组把“inner planets”译为“内行星”是不准确的] 内行星（Inferior planet）：水星和金星的绕日运行轨道在地球轨道以内，故称为内行星。
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... 当白天变成黑夜：日食 (When Day Becomes Night: A Solar Eclipse) 内行星 (The Inner Planets) 水星 (Mercury) ...
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... inner Lagrangian point 内拉格朗日点 inner planet 内行星 inner solar system 内太阳系 ...
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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。
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.
在所有的内行星中，只有水星和地球拥有这样一个领域。
Of all the inner planets, only Mercury and Earth boast such a field.
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。
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.
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