But sunlight is not the only way to heat an astronomical body. Gravity can do it, too.

但太阳光并非让一个天体热起来的唯一途径，引力也可以。

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The so-called "food" is a celestial body that was another celestial body or its Heiying Yanzhe all or part of the astronomical scene.

所谓"食"就是指一个天体被另一个天体或其黑影全部或部分掩遮的天文景象。

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