Quote:
Originally Posted by Tacitus
And fears over sending radio signals to other worlds seem a bit nonsensical when you consider that advanced aliens dozens or perhaps even hundreds of light years away can probably already see that Earth is home of abundant life. And anyone observing the night side of our little planet, at least the light leaving it within the past 40-50 years, will probably figure out that something unnatural is making that sodium glare! We already betray our presence to those who care to look in our direction.
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Indeed. Our radio messages can only reveal our presence to a civilization similar to ours, more advanced civilization would know of us already and less advanced don't have the technology needed. Since our current technical phase will be very short (we either become more advanced or screw up), the chance of having a similar civilization in the direction of the signal is infinitesimally small.
It should be obvious that a xenophobic civilization which wants to destroy us would be very keen to find every possible civilization and therefore would already know of us, no matter if we sent radio signals or not.