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  2. Extraterrestrial life - Wikipedia

    en.wikipedia.org/wiki/Extraterrestrial_life

    Although no extraterrestrial life has been found and life may still be just a rarity from Earth, there are scientific reasons to suspect that it can exist elsewhere, and technological advances that may detect it if it does. [152] Many scientists are optimistic about the chances of finding alien life.

  3. Shadow biosphere - Wikipedia

    en.wikipedia.org/wiki/Shadow_biosphere

    A shadow biosphere is the hypothesis of a hypothetical microbial biosphere of Earth that would use radically different biochemical and molecular processes from that of currently known life. Although life on Earth is relatively well studied, if a shadow biosphere exists, it may still remain unnoticed because the exploration of the microbial ...

  4. Rare Earth hypothesis - Wikipedia

    en.wikipedia.org/wiki/Rare_Earth_hypothesis

    The Rare Earth hypothesis argues that planets with complex life, like Earth, are exceptionally rare.. In planetary astronomy and astrobiology, the Rare Earth hypothesis argues that the origin of life and the evolution of biological complexity, such as sexually reproducing, multicellular organisms on Earth, and subsequently human intelligence, required an improbable combination of astrophysical ...

  5. Extraterrestrial: The First Sign of Intelligent Life Beyond Earth

    en.wikipedia.org/wiki/Extraterrestrial:_The...

    On August 24, 2023, The New York Times published an article about Loeb and his related search for signs of extraterrestrial life and his related publications. [24] A followup book, entitled Interstellar: The Search for Extraterrestrial Life and Our Future in the Stars, was published on August 29, 2023. [24] [25]

  6. Signs of alien life could be found in a single grain of ice ...

    www.aol.com/signs-alien-life-could-found...

    Alien life could be found in a tiny grain of ice, researchers have said. The discovery suggests that upcoming telescopes might be able to spot extraterrestrial life relatively soon.

  7. Extraterrestrial UFO hypothesis - Wikipedia

    en.wikipedia.org/wiki/Extraterrestrial_UFO...

    Space aliens are alleged to be overwhelmingly humanoid, and are allegedly able to exist on Earth without much difficulty often lacking "space suits", even though extra-solar planets would likely have different atmospheres, biospheres, gravity and other factors, and extraterrestrial life would likely be very different from Earthly life.

  8. Great Filter - Wikipedia

    en.wikipedia.org/wiki/Great_Filter

    The Great Filter is the idea that, in the development of life from the earliest stages of abiogenesis to reaching the highest levels of development on the Kardashev scale, there is a barrier to development that makes detectable extraterrestrial life exceedingly rare. [1] [2] The Great Filter is one possible resolution of the Fermi paradox.

  9. Extraterrestrial life may only be 14 light years away - AOL

    www.aol.com/news/2015-12-17-extraterrestrial...

    Wolf 1061c is roughly four times bigger than Earth and takes 18 days to revolve around its star, which is much cooler than our sun. It joins the ranks of a over a thousand potentially habitable ...