Quote:
Originally Posted by bmitchell82
I may just be a little ignorant, but they are showing that as a nice little bubble expanding from our little blue ocean 
Now i don't know about you but our lovely modern day signals if there are say mountains and what not between i have never found the signal to be any good. There in lays my question how did it pass though the Earth? and if it did pass around the out side how did it get out? If this is actually the case, then half that sphere and reduce the amount of people who might hear it!
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They aren't talking about an individual transmission, rather our total planet-wide transmission. But even if it was just one transmission, if the transmission last for 12 hours the entire sky has been covered. Yes, technically one side of the sphere would be 12 light-hours smaller than the other but at the scale of the diagram this is impossible to see. Details aside, the take home message is that not much of the galaxy has even had the chance to hear us.