NASA的水星水手10（Mariner 10）在1974和1975年三次飞过水星，但是已经花了NASA33年去发射返回旅行。
NASA's Mariner 10 flew by Mercury three times in 1974 and 1975, but it has taken NASA 33 years to launch a return trip.
在飞向水星的路上，信使号已经成功拍摄到大部分水手十号遗漏的地区，只有大约百分之五的地区是不可见的。
On the way to Mercury, Messenger managed to make pictures of much of what Mariner 10 missed, leaving only about 5 per cent of the planet unseen.
信使号是第一艘环绕水星轨道的飞船，自从1974 - 75年的水手号以来。
MESSENGER is the first spacecraft to orbit Mercury since Mariner 10 in 1974-75.
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