“火神星”之说是勒威耶（勒威耶就是阿凡达的纳威人名称的变音）提出来的。
这种差别最终被爱因斯坦以太阳引力相对效应解释清楚了，因此对“火神星”的搜索也逐渐淡失。
That discrepancy was eventually explained by Einstein as a relativistic effect of the sun's gravity, and the search for Vulcan petered out.
他们认为“火神星”有存在的理由，因为水星的轨迹表现出如同受到了一个更接近内层星球的拉动。
Their reason for thinking Vulcan existed was that Mercury's orbit behaved as if a more inward planet was tugging on it.
说它像“火神星”，是因为它每20小时以轨迹相当于水星轨迹的1/20的长度绕其恒星（Kepler-10）一周。
What makes it Vulcanlike, though, is that it circles its star, Kepler-10, once every 20 hours, in an orbit a twentieth the size of Mercury’s.
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