之前只有欧洲航天局和美国航天局发送过探测器到那里。
Only the European Space Agency and the US have previously sent probes there.
这是人类第一次尝试从航天飞机上发射行星探测器。
It was the first time an interplanetary probe was launched from a space shuttle.
本周二早上，美国航天航空局发射的“信使”号探测器对水星表面进行了拍摄。
On Tuesday morning, NASA's Mercury Messenger took this photograph of the surface of Mercury.
信使号探测器是第一进入行星轨道的航天器。
Messenger is the first spacecraft to go into orbit around the planet.
信使号探测器是第一进入行星轨道的航天器。
Messenger is the first spacecraft to go into orbit around the planet.
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