美國航天局將發射月球探測器

The U.S. space agency is preparing for Thursday's launch of two unmanned spacecraft to the moon, nearly forty years after man last walked on the moon.

NASA's Gravity Recovery and Interior Laboratory, or GRAIL, mission spacecraft will orbit the moon before landing on the lunar surface.

The mission will map the moon from its core to its surface, including the far side of the moon which humans have never explored.

Tuesday, NASA released high resolution photographs showing the remnants of the space agency's previous lunar visits. The photos show tire tracks from the Apollo 17 lunar rover.

In November, NASA will launch a spacecraft bound for Mars. The flight to Mars is expected to last two years.

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美國航天局準備星期四發射兩個無人月球探測器。這次發射距離上次人類登月將近40年。

美國航天局的重力恢復與內部實驗室計劃，又稱“聖盃”號月球探測器將首先環繞月球軌道飛行，然後在月球表面着陸。這次使命將對月球內部從核心到表明的內部構造進行測繪，包括人類從未探索過的月球暗面。

星期二，美國航天局公佈了顯示美國航天局此前登月任務痕跡的高清照片。有照片顯示阿波羅17號釋放的月球車在月球表面留下的輪胎痕跡。

美國航天局將在11月發射火星探測器。預計探測器將需要兩年時間抵達火星。