 Oortcloud says: Some people insist that the Earth has been leaking signals into space for the last few decades and by now we should have gotten someone's attention or heard someone else out there leaking signals. The fact is that you would need a radio dish the size of the Arecibo dish (pictured above) to pick up a good signal only as far away as Saturn. Any farther than that and even that dish will only yield static. Could it be the time factor. Possible visitors are given greater credence by the artefacts such as the rock that is a million years old and they found what looked like a sparkplug inside it. Civilizations come and go and may or may not be advanced enough to communicate ( by the time they learn how, who knows what this planet could be like). Lots of room for conjecture. They may even be snobs and see us as not worth connecting with. "They may even be snobs and see us as not worth connecting with." LOL! Again, because of the nature of radio transmissions the more time that passes the larger our transmission "bubble" becomes and the more power needed to transmit a viable signal. From the article : Even if the universe is thick with signal-slinging civilizations, including some old enough that their indiscriminate electromagnetism has had sufficient time to reach Earth, not even the most massive and sensitive equipment of science is currently capable of plucking the signal from the static. When any non-focused electromagnetic signal is generated– such as a television broadcast or a cell phone conversation– the energy propagates as a spherical wavefront at the speed of light. When a sph... |
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