NASA称，当信使号进入水星轨道时，它距离太阳2800万英里(4600万公里)同时距离地球9600英里(15,500万公里)。
MESSENGER was 28 million miles (46 million kilometers) from the sun and 96 million miles (155 million kilometers) from Earth when it headed into Mercury's orbit, NASA said.
当太空探测器信使号在三个月前到达离太阳最近的地方并回望地球时，它找到了答案。
The robotic spacecraft MESSENGER found out as it looked toward the Earth during its closest approach to the Sun about three months ago.
信使号于六年前发射，穿过太阳系内部，飞越地球、金星和水星。
Messenger was launched more than six years ago, travelling through the inner solar system and embarking on flybys of Earth, Venus and Mercury.
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