Can you see that little blue dot in the picture below? OK, it'll help to look at the expanded section in the lower right hand corner. See it now? That's how far humanity's earliest radio signals – right at a hundred years old now and moving at the speed of light – have spread out into our Milky Way galaxy.
Beyond hat-tipping to the original article at Popular Mechanics and to The SWLing Post blog for pointing this out, it's hard to find anything to add to this one.
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