As on the Moon, the extent of large impact cratering serves as an age indicator for the Martian surface.

和在月球的一样，大型撞击陨石坑的范围之广可以显示出火星表面的年龄。

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As on the Moon, the extent of large impact cratering (i.e. craters too big to have been filled in by erosion since they were formed) serves as an age indicator for the Martian surface.

与月球上相同，那些巨大陨石坑的范围（例如，那些巨大到自形成后尚未被尘埃填满的陨石坑）标志着火星表面的年龄。

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But there are compelling reasons in favor of another Moon landing too, not the least of which is trying to pinpoint the moon's age.

但也存在令人信服的理由支持再度登月，其中包括试图确定月球的年龄。

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The Second Era, which saw Soviet cosmonauts and U.S. astronauts almost routinely venturing into space, was punctuated in 1969 when Neil Armstrong (who, in a sad irony, just passed at the age of 82) and Dr. Buzz Aldrin became the first humans to land on the Moon.

FORBES: Launching the Next Era in Space Travel and Exploration

The place had all the glamour of the space age then, with its glassy offices and swooping pavilions, moon rovers and rocket ships.

NEWYORKER: The Martian Chroniclers

Mr Duncan starts with a Stone Age astronomer who observed the phases of the moon, and marked them by carving notches on an eagle's bone.

ECONOMIST: Late for the date