Still - at some radio frequencies, Earth has become by far the brightest object in the Solar System. Anyone within a roughly 90 light-year radius, who is scanning the sky thoroughly across a broad radio spectrum, has a good chance of noticing us by now. Please Register or Log in to view the hidden image! Of course, there may not be any other intelligent life within 90 light years - or 9000... Please Register or Log in to view the hidden image!