(May 2, 2015 at 5:18 pm)Chuck Wrote:(May 2, 2015 at 4:45 pm)Iroscato Wrote: This picture may go some of the way towards explaining at least one of the many reasons why we haven't made contact yet. We tend to forget how huge the galaxy really is (let alone the rest of the universe), and how insignificant even our largest footprint in the universe - our radio signal sphere - really is.So?
The initial Radio broadcast from a civilization that attained radio technology just 0.001% of the age universe before we did would by now be detectable within a sphere larger than the diameter of the disk of Milky Way. So if radio is the persistent means by which civilizations advertise themselves, or detect others, then any civilization that attain radio technology would be known to the entire galaxy within less time than it took for archaic homo sapien to evolve into homo sapien sapiens. If there are civilizations that attain radio technology 100,000 years or so earlier than we did, we ought to be hearing multiple overlapping signals from radio broadcasts of multiple technic civilizations that are more advanced than we by different amount.
The explanation why we don't would have to be either that there are no such civilizations within a distance from which our equipment could hear their leaking radio transmissions, or that radio communication, or radio leakage, is a relatively transient stage in the technological development of cultures.
If radio or low energy EM is a transient means of advertisement and detection, than out signals may elicit no response simple because those who can intercept them and understand them wouldn't be listening for them.
Well like I said, it's hardly the deciding factor, it is part of the reason for one element. And a radio sphere with 100,000 light years would be extraordinarily faint, and I doubt we would ever pick up a signal from that or comparable distances.
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