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<blockquote data-quote="Nellisir" data-source="post: 6255688" data-attributes="member: 70"><p>Given our current capabilities, probably. If they're 200 light years away, it's still the early 1800's and we're not yet lighting up the globe. Could be atmostpheric changes due to industrialization, though. They could detect oxygen in our atmosphere, I think.</p><p></p><p></p><p></p><p>It could be, but there are a lot of stars that aren't "a few hundred light years away". This page, for instance estimates 15,000 stars within 100 light years of us, of which roughly 11,160 are Class M-type stars, like our sun. Given what the telescopes have been telling us about extra-solar planets, it seems a lot of stars, even red dwarfs (which are often Type M and very long lived and stable) are capable of planets and a habitable (by our standards) zone. Communicating over thousands of years would be hard, but fifty years? Not so much. It would be weird if civilizations _never_ occurred within some kind of reasonable range of each other. Sometimes, yes, but at other times and places you might have clusters. I think it's more likely the period of radio activity is fairly brief in a species lifespan (we're at about .1% right now).</p><p></p><p></p><p>Moot would be quitting now. When we've checked everything out to a few hundred light years and found no life (not civilization, just life), then I'd consider taking a rest. If we can find ONE other instance of life, of any kind, then the whole equation changes.</p></blockquote><p></p>
[QUOTE="Nellisir, post: 6255688, member: 70"] Given our current capabilities, probably. If they're 200 light years away, it's still the early 1800's and we're not yet lighting up the globe. Could be atmostpheric changes due to industrialization, though. They could detect oxygen in our atmosphere, I think. It could be, but there are a lot of stars that aren't "a few hundred light years away". This page, for instance estimates 15,000 stars within 100 light years of us, of which roughly 11,160 are Class M-type stars, like our sun. Given what the telescopes have been telling us about extra-solar planets, it seems a lot of stars, even red dwarfs (which are often Type M and very long lived and stable) are capable of planets and a habitable (by our standards) zone. Communicating over thousands of years would be hard, but fifty years? Not so much. It would be weird if civilizations _never_ occurred within some kind of reasonable range of each other. Sometimes, yes, but at other times and places you might have clusters. I think it's more likely the period of radio activity is fairly brief in a species lifespan (we're at about .1% right now). Moot would be quitting now. When we've checked everything out to a few hundred light years and found no life (not civilization, just life), then I'd consider taking a rest. If we can find ONE other instance of life, of any kind, then the whole equation changes. [/QUOTE]
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