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There are things the NASA chief has "come across in the job that he can’t explain," but aliens are not among them.

In that framework, a NASA researcher mapping how alien societies could fill the Milky Way is not imagining a single dramatic encounter, but tracing a dynamic ecosystem of births, expansions and ...

NASA is back on the world stage after a month of frustrating silence caused by the recent US government shutdown. They are bringing with them a stunning new look at one of the most important ...