美国国家航空和宇宙航行局的研究小组现在表示，他们已经证明，它们不可能是由爆炸本身产生的。
The NASA team is now saying they have proved that they could not have been produced by the blast itself.
这项任务是由美国国家航空和宇宙航行局的勘探和开发任务感兴趣的本土资源利用。
The mission was sponsored by NASA's Exploration division, which is interested in developing missions that make use of indigenous resources.
同年十一月，卡内基研究协会与美国国家航空和宇宙航行局也就此话题举行了一次专题会议。
In November the Carnegie Institution and America's space agency, NASA, held a conference on the topic.
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