| http://www.w3.org/ns/prov#value | - But the fact we have not seen any may mean our galaxy is a lonely place, Dr Forgan warns, The fact we have not seen probes of this type makes it difficult to believe that probe building civilisations have existed in the Milky Way in the last few million years"[Related: New hunt for aliens who move stars"]NASA's Voyager 1The probes would only need to travel around 10% of the speed of light to expl
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