If an alien race sent a Voyager-type probe towards us, would we be able to detect it?
Paul Manson, Aberdeen, UK
We pay £25 for every answer published in Âé¶¹´«Ã½. To answer this question – or ask a new one – visit newscientist.com/lastword. Terms and conditions apply.
This article appeared in print under the headline “Journey’s end”
Advertisement
Topics:



