Messenger is about halfway through its journey to put it in permanent orbit around Mercury in 2011.But, until then, there will be another flyby this October and again in September 2009.

• “信使号”将在2011年进入水星周围的永久轨道，它已经飞了大约一半的旅程，在进入轨道之前，“信使号”还要在今年10月和2009年9月再度近距离飞越水星的上空。