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THE DETRACTORS. “Other variants on "Fact A" are the "Great Silence" of Brin (1983) and the "Eerie Silence" of Davies (2011), both of which refer to the more general fact that we have not yet found any evidence of extraterrestrial intelligent life in the universe.” https://lnkd.in/dKzsrBv View in LinkedIn

LIMITED SEARCHING. “If we analogously relax Fact A and assert merely that there are no alien machines in the solar system today, then its truth becomes quite uncertain because we have not done much searching for such machines.” https://lnkd.in/dKzsrBv View in LinkedIn

Cross sections through geologic time posted randomly in vertical orientation. View in LinkedIn

COEVOLUTION. “Life has evolved in conjunction with the rest of the universe. We are an embodiment of the same laws that have shaped the universe and our imagination is intimately correlated to it. Consciously or subconsciously we find that we converge towards these laws.” Page 7, Decoding Reality: The Universe as Quantum Information" "By Vlatko Vedral. https://lnkd.in/gH7NMvV View in LinkedIn

ANALOGY. “Wright et al. (2014) noted that his assumption fails for the only technological species we have an example of: humanity. The ratio of the timescales for humans to cross the Earth to the age of the technology that enables such travel is small: today for aircraft, it is roughly 10(-4 ) days over decades, but even a thousand years ago it was under 10(-3) years over millennia. Despite this, most spots on Earth show no obvious signs of humans or our technology. “ https://lnkd.in/dKzsrBv View in LinkedIn

PREMISE TO “FACT A”: “One of the central assumptions behind the significance of "Fact A" to SETI is that any spacecraft arriving in the solar system would result in the permanent settlement of the Earth.” https://lnkd.in/dKzsrBv View in LinkedIn

FERMI PARADOX. “A particularly trenchant formulation of this inconsistency is that of Hart (1975), who dubs the fact that there are not aliens on Earth now "Fact A." This fact is supposedly surprising because the time for an exponentially growing population to travel to every star in the Galaxy under even rather conservative assumptions of the feasibility of interstellar travel is short compared to the age of the Galaxy. Many have used this and similar articulations of the Fermi Paradox to argue that the entire endeavor of SETI is a "waste of time".” https://lnkd.in/dKzsrBv View in LinkedIn

PREMISE: WE HAVE BARELY LOOKED. “Tarter et al. and others have argued strongly to the contrary: bright and obvious radio beacons might be quite common in the sky, but we would not know it yet because our search completeness to date is so low, akin to having searched a drinking glass's worth of seawater for evidence of fish in all of Earth's oceans.” https://lnkd.in/dKzsrBv View in LinkedIn

PREMISE: WE HAVE SEARCHED FAR AND WIDE. “Many articulations of the Fermi Paradox have as a premise, implicitly or explicitly, that humanity has searched for signs of extraterrestrial radio transmissions and concluded that there are few or no obvious ones to be found.” https://lnkd.in/dKzsrBv View in LinkedIn