https://www.universetoday.com/165005/aft...e_vignette
EXCERPTS: . . . Despite decades of observation and SETI surveys, there is still no definitive evidence that advanced extraterrestrial civilizations are out there. [...] these searches have found no compelling evidence of technosignatures within our galaxy or beyond. According to Crawford and Schulze-Makuch, the “Great Silence” we perceive when we look out into the Universe can only mean one of two things. First, there’s the possibility that the Hart-Tipler Conjecture is correct, and there are no advanced ETC out there. Similarly, it may be that intelligent life (or life in general) is rare in the Universe due to the odds being stacked against its emergence or evolution (aka. the Great Filter).
If neither of these scenarios is true, we are left with only one answer: the Zoo Hypothesis is correct and advanced civilizations are keeping their distance to avoid being detected...
[...] In summary, the Zoo Hypothesis predicts that we shall never find them because they do not want to be found, and they have the technological ability to ensure this. This theory is similar to the Planetarium Hypothesis, which also posits that advanced civilizations have the means to elude detection from our instruments. Unlike the Planetarium Hypothesis, the Zoo Hypothesis assumes that the intentions of the ETCs are benign, which could include wanting to avoid interfering with our technological or social development (i.e., the “Prime Directive” from Star Trek)...
[...] Perhaps, rather than simply observing distant stars for signs of transmissions or other technological activity, we should also look for evidence of advanced civilizations closer to home. This is the path being pursued by Professor Avi Loeb and his colleagues at the Galileo Project, which hopes to complement conventional SETI by searching for evidence of ETC technology and artifacts within our Solar System... (MORE - missing details)
EXCERPTS: . . . Despite decades of observation and SETI surveys, there is still no definitive evidence that advanced extraterrestrial civilizations are out there. [...] these searches have found no compelling evidence of technosignatures within our galaxy or beyond. According to Crawford and Schulze-Makuch, the “Great Silence” we perceive when we look out into the Universe can only mean one of two things. First, there’s the possibility that the Hart-Tipler Conjecture is correct, and there are no advanced ETC out there. Similarly, it may be that intelligent life (or life in general) is rare in the Universe due to the odds being stacked against its emergence or evolution (aka. the Great Filter).
If neither of these scenarios is true, we are left with only one answer: the Zoo Hypothesis is correct and advanced civilizations are keeping their distance to avoid being detected...
[...] In summary, the Zoo Hypothesis predicts that we shall never find them because they do not want to be found, and they have the technological ability to ensure this. This theory is similar to the Planetarium Hypothesis, which also posits that advanced civilizations have the means to elude detection from our instruments. Unlike the Planetarium Hypothesis, the Zoo Hypothesis assumes that the intentions of the ETCs are benign, which could include wanting to avoid interfering with our technological or social development (i.e., the “Prime Directive” from Star Trek)...
[...] Perhaps, rather than simply observing distant stars for signs of transmissions or other technological activity, we should also look for evidence of advanced civilizations closer to home. This is the path being pursued by Professor Avi Loeb and his colleagues at the Galileo Project, which hopes to complement conventional SETI by searching for evidence of ETC technology and artifacts within our Solar System... (MORE - missing details)