Analysis of the lunar rocks and soil brought back to Earth by the Apollo astronauts and by unmanned luna landers allowed researchers to get a glimpse of the moon's evolution.

分析由阿波罗太空船的太空人和月球号无人登陆艇带回的月球岩石和土壤，研究人员得以窥想月球的演化。

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Northrop Grumman built the very first manned lunar landers back in the 1960s (when the company was called Grumman) for NASA's Apollo program.

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