如果对曝露的风险不完全了解，任何去其它行星(如火星)的载人探测任务都可能危及宇航员的健康。

Any manned mission to other planets, such as Mars, could endanger astronauts' health if the risks of exposure are not fully known.

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迄今为止，围绕月球，共开展了73项科学探测任务，载人或者无人，以了解月球的化学成分，尤其是发现水，更是重点关注的项目。

There have been 73 missions, manned and unmanned, to the Moon, and understanding its chemical composition, particularly finding water, has always been a priority.

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该任务将质疑SLS对于深空探测是否实际需要，尤其是SLS猎户座载人飞行一直到2021年还没有开始，Muncy说。

The mission would call into question whether SLS is actually needed for deep space exploration, especially with crewed Orion flights on SLS not beginning until 2021, Muncy said.

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