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<blockquote data-quote="Jester David" data-source="post: 6254936" data-attributes="member: 37579"><p>Radio signals are not particularly strong, being unable to easily reach across the planet. I can barely get a strong signal from the city out where I live in the 'Burbs. A lot of radio noise would become hard to distinguish from background radiation.</p><p>Realistically, the lifespan of radio is short. We've had commercial radio for less than 100 years and it's already being phased out for satellite and cable transmissions. In ten to thirty years Earth will all but be a transmission dead sphere. </p><p>We were only really listening to the skies for half a century, and could easily have missed the window of signals.</p><p></p><p>That's assuming other races develop radio at all. Radio might not work as well for a race lacking strong ears, or without auditory communication, or without an atmosphere that reflects radio waves limiting their use. Or they might stick with wired communication. </p><p></p><p>It's also possible extraterrestrial life might not be interested in communicating, being more introspective. Or life might be common but advanced alien life might be rare. </p><p></p><p>I believe alien life is likely common. The universe us likely lousy with life. Intelligent life is likely much rarer. </p><p>Intelligence requires environmental stability that isn't continually wiping out life. A big gas giant like Jupiter sucking up asteroids also helps. But there needs to be enough changes that various races are forced to re-adapt and alternate races are allowed to take over. Dinosaurs ruled for millions of years without developing intelligence. </p><p>Technology also requires some other factors. If you can't forge metals you're at a disadvantage, and worlds lacking appropriate metals would be all but stuck at the Stone Age. </p><p>North American civilizations started at the sane keel of advancement as the old world countries but fell behind for a few reasons. A lack of riding animals (horses) was likely one, as that hindered larger land empires. And, in North America, there were few cities and permanent settlements. Multiple city-states are vital for preventing knowledge from being lost when obey civilization falls. When Rome fell much of its knowledge was preserved by the Arabic empire. The multiple continents really help defend human civilization from being ended by natural disasters. </p><p>So much of human technology comes from warfare. A less tribal species might not have advanced nearly as fast.</p></blockquote><p></p>
[QUOTE="Jester David, post: 6254936, member: 37579"] Radio signals are not particularly strong, being unable to easily reach across the planet. I can barely get a strong signal from the city out where I live in the 'Burbs. A lot of radio noise would become hard to distinguish from background radiation. Realistically, the lifespan of radio is short. We've had commercial radio for less than 100 years and it's already being phased out for satellite and cable transmissions. In ten to thirty years Earth will all but be a transmission dead sphere. We were only really listening to the skies for half a century, and could easily have missed the window of signals. That's assuming other races develop radio at all. Radio might not work as well for a race lacking strong ears, or without auditory communication, or without an atmosphere that reflects radio waves limiting their use. Or they might stick with wired communication. It's also possible extraterrestrial life might not be interested in communicating, being more introspective. Or life might be common but advanced alien life might be rare. I believe alien life is likely common. The universe us likely lousy with life. Intelligent life is likely much rarer. Intelligence requires environmental stability that isn't continually wiping out life. A big gas giant like Jupiter sucking up asteroids also helps. But there needs to be enough changes that various races are forced to re-adapt and alternate races are allowed to take over. Dinosaurs ruled for millions of years without developing intelligence. Technology also requires some other factors. If you can't forge metals you're at a disadvantage, and worlds lacking appropriate metals would be all but stuck at the Stone Age. North American civilizations started at the sane keel of advancement as the old world countries but fell behind for a few reasons. A lack of riding animals (horses) was likely one, as that hindered larger land empires. And, in North America, there were few cities and permanent settlements. Multiple city-states are vital for preventing knowledge from being lost when obey civilization falls. When Rome fell much of its knowledge was preserved by the Arabic empire. The multiple continents really help defend human civilization from being ended by natural disasters. So much of human technology comes from warfare. A less tribal species might not have advanced nearly as fast. [/QUOTE]
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