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.
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。
The planet orbiting Kepler 10, by contrast, has an orbital period of a mere 20 hours and is so dense that it is probably made of iron.
相比之下在开普勒-10轨道中发现的那颗行星其轨道周长只有20小时，而且密度很高以至于研究员估计行星内部是由铁组成的。
As we reported last month, an object surprisingly similar to an astronomical wild-goose from the 19th century, the mythic planet Vulcan, was found orbiting a star dubbed Kepler 10.
正如我们上周报道的，研究员们发现了一颗物体同19世纪天文学界著名的伏尔甘行星出奇的相似，这颗物体正在按被称之为开普勒- 10的恒星轨道上运行。
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