4 ms·
That seems unlikely to me. Why wouldn't at least a few alien civilisation keep broadcasting radio signals just to let others know they are there too ?
by johnchristopher 12y ago
That seems unlikely to me. Why wouldn't at least a few alien civilisation keep broadcasting radio signals just to let others know they are there too ?
- justinpombrio 12y agoNot for very long. http://xkcd.com/1377/ http://xkcd.com/1377/
- ceejayoz 12y agoMaybe there a much better ways of doing so that we discover in another couple decades? Who knows.