The craft, known as MESSENGER, began the orbit around 9:00 p.m. (0200 GMT) on a mission to circle the planet for one Earth year in an unprecedented study of the tiny, hot planet.

名为“信使”号的该航天器于晚上9点(格林威治标准时间凌晨2点)进入水星轨道，并在此后为期1地球年的时间内，环绕这个细小炎热行星进行史上第一次的研究。

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These lines follow underwater mountains, where hot liquid rock flows up from deep inside the planet.

VOA: special.2010.01.12

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