There's a reason why aliens haven’t visited Earth yet, say scientists
Satellite over Earth - Michael Dunning/The Image Bank RF/ have never visited Earth despite the Universe being so old and so vast that races should have evolved interstellar travel and come calling by now. Now two scientists believe they may have the answer./ Astrobiologists Dr Michael Wong, of the Carnegie Institution for Science in Washington, and Dr Stuart Bartlett, of California Institute of Technology, have hypothesised that civilisations burn out when they grow too large and technical. Faced with an ever-growing population and ...
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