Although their missions blended commercial and political-military imperatives, the explorers involved all accomplished some significant science simply by going where no scientists had gone before.

虽然他们的任务混合了商业和政治军事的需要，但相关的探险者都完成了一些重要的科学任务，因为他们去了以前没有科学家去过的地方。

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There was no grand follow-up to the Apollo missions.

阿波罗计划没有后续的大动作。

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Without that research and investment, there is no foundation to build our future missions and discovery, "Braun added."

没有这些研究和投入，就没有完成我们未来任务和新发现的基础，“布劳恩补充道。”

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No other missions are scheduled but Russian space officials hope to keep Mir in orbit beyond its scheduled retirement this summer.

CNN: Space crew reaches Mir for possibly last mission

This study incorrectly maintained that there are no prospective military missions for the NASP.

CENTERFORSECURITYPOLICY: Get The National Aerospace Plane Off The Ground

But the field could develop fast, as prototype picosatellites can ride along with other missions at almost no extra cost.

ECONOMIST: Picosatellites