Couple things:
People do indeed not even begin to grasp how massive space is. Radio signals take a half hour just to get to Mars and that's when its closer to us. We have gotten really good at looking for specific things that might signify advanced life at amazing distances, but its still largely confined to just our local Orion Spur galactic sub arm. And even if you find something, there are a lot of alternative explanations for what it could be. The upside is usually a lot of these false positives lead us to new discoveries in astronomy (Pulsars being one example), so its not a waste to try. But the scope and scale of distances, the constant interferences (Space if far from empty, especially in terms of radiation and EM), and the limits of our own technology mean we can only look in our "local" corner of this one galaxy.
Ostensibly, if FTL is impossible then everyone dies on their little ball of rock because any sort of large scale colonization without it, at least in terms of communications, is ridiculously difficult. Maintaining a human presence on another moon in our own solar system, say something like Io or Europa, would be near impossible from a logistical standpoint. It took armies of people with the best computers of the day just to manage three dudes in a tin can in high earth orbit. And that part has not changed much. You arguably need FTL communication more than genetic engineering to have manned flight work out beyond one or two AUs, otherwise Mars is probably as far as we are getting.
But even without FTL being possible, there is the possibility of other worlds with life existing along with advanced life that might send out radio waves. But so much of this is based on assumptions that life will be like it is on earth. We have no reason to expect that life elsewhere would resemble it here, chemically or physically. Its entirely possible there are living worlds that we can observe that we simply do not recognize them as such.
But the Fermi Paradox is a larger topic, which the Great Filter is one aspect of. I do think that the Great Filter applies to us, specifically. But thinking that any sort of alien civilization would have similar cultural aspects to our own is a very big and self serving assumption. Again separate discussion. I think the OP wants to specifically talk about the Filter and how it applies to the human condition.
People do indeed not even begin to grasp how massive space is. Radio signals take a half hour just to get to Mars and that's when its closer to us. We have gotten really good at looking for specific things that might signify advanced life at amazing distances, but its still largely confined to just our local Orion Spur galactic sub arm. And even if you find something, there are a lot of alternative explanations for what it could be. The upside is usually a lot of these false positives lead us to new discoveries in astronomy (Pulsars being one example), so its not a waste to try. But the scope and scale of distances, the constant interferences (Space if far from empty, especially in terms of radiation and EM), and the limits of our own technology mean we can only look in our "local" corner of this one galaxy.
Ostensibly, if FTL is impossible then everyone dies on their little ball of rock because any sort of large scale colonization without it, at least in terms of communications, is ridiculously difficult. Maintaining a human presence on another moon in our own solar system, say something like Io or Europa, would be near impossible from a logistical standpoint. It took armies of people with the best computers of the day just to manage three dudes in a tin can in high earth orbit. And that part has not changed much. You arguably need FTL communication more than genetic engineering to have manned flight work out beyond one or two AUs, otherwise Mars is probably as far as we are getting.
But even without FTL being possible, there is the possibility of other worlds with life existing along with advanced life that might send out radio waves. But so much of this is based on assumptions that life will be like it is on earth. We have no reason to expect that life elsewhere would resemble it here, chemically or physically. Its entirely possible there are living worlds that we can observe that we simply do not recognize them as such.
But the Fermi Paradox is a larger topic, which the Great Filter is one aspect of. I do think that the Great Filter applies to us, specifically. But thinking that any sort of alien civilization would have similar cultural aspects to our own is a very big and self serving assumption. Again separate discussion. I think the OP wants to specifically talk about the Filter and how it applies to the human condition.
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