A new paper argues Earth's bubble of radio signals sent into the universe is still very small, and unlikely to have reached other life forms
What’s more, if a civilization were to have received our signal and sent back a response by now, it would have to be located just 50 light years away since, it would take 50 years for our radio beacon, traveling at the speed of light, to have reached it, and another 50 years for the receiver to have sent back a message. That’s a whopping century for just a two-way hello. Not that there aren’t candidates within that small footprint in space.
A highly advanced alien civilization could, of course, also send a probe toward Earth instead of a radio beacon, but that is even less probable—and harder to do in anywhere near the 100 years we’ve been sending our radio semaphores into space. Never mind all of the talk about, it would take a long, long time and a lot of technological prowess to send even a relatively small spacecraft our way.
Belgique Dernières Nouvelles, Belgique Actualités
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