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  2. Detecting extraterrestrial life is challenging because12:
    1. Finding planets that could harbor life is difficult. We need to locate temperate, rocky, Earth-sized worlds that could have liquid water.
    2. Detecting their distant and faint atmospheres is a challenge.
    3. Determining whether life originated there in the past is also complex.
    4. Conditions for the origin and evolution of life are likely to be rare.
    Learn more:
    The crux of the challenge is the difficulty of not just finding planets that could harbor life as we know it — which implies temperate, rocky, Earth-sized worlds that could harbor liquid water — but also detecting and looking into their profoundly distant, and faint, atmospheres.
    mashable.com/article/james-webb-space-telescop…
    The presence of life on some other planet or moon requires not only that life can survive, but also that it originated there in the past. We expect that Earthlike, water-based life could find many habitable planetary bodies in the universe. But conditions for the origin and evolution of life are likely to be more rare.
    www.smithsonianmag.com/air-space-magazine/ho…
     
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    Fermi paradox - Wikipedia

    The Fermi paradox is the discrepancy between the lack of conclusive evidence of advanced extraterrestrial life and the apparently high likelihood of its existence. As a 2015 article put it, "If life is so easy, someone from somewhere must have come calling by now." Italian-American physicist Enrico Fermi's name … See more

    The following are some of the facts and hypotheses that together serve to highlight the apparent contradiction:
    • There … See more

    There are two parts of the Fermi paradox that rely on empirical evidence—that there are many potentially habitable planets, and that humans see no … See more

    Rarity of intelligent life
    Extraterrestrial life is rare or non-existent
    Those who think that intelligent extraterrestrial life is (nearly) impossible argue that the conditions needed for the evolution of life—or at least the evolution of biological complexity See more

    Fermi was not the first to ask the question. An earlier implicit mention was by Konstantin Tsiolkovsky in an unpublished manuscript from … See more

    The Fermi paradox is a conflict between the argument that scale and probability seem to favor intelligent life being common in the universe, and the total lack of evidence of intelligent life having ever arisen anywhere other than on Earth.
    The first aspect of … See more

    Aestivation hypothesis – Hypothesized solution to the Fermi paradox
    Anthropic principle – Hypothesis about sapient life and the … See more

    • Rebecca Boyle and Quanta Magazine (March 10, 2019). "Moving Stars Might Speed the Spread of Alien Life". The Atlantic See more

     
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