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  2. Extraterrestrial life - Wikipedia

    en.wikipedia.org/wiki/Extraterrestrial_life

    Extraterrestrial life may still be stuck using RNA, or evolve into other configurations. It is unclear if our biochemistry is the most efficient one that could be generated, or which elements would follow a similar pattern. [55]

  3. Extraterrestrial - Wikipedia

    en.wikipedia.org/wiki/Extraterrestrial

    Extraterrestrial may refer to: Extraterrestrial life , life that occurs outside of Earth and that probably did not originate from Earth Extraterrestrial (TV program) , a program on the National Geographic Channel

  4. Extraterrestrial intelligence - Wikipedia

    en.wikipedia.org/wiki/Extraterrestrial_intelligence

    Extraterrestrial intelligence (ETI) refers to hypothetical intelligent extraterrestrial life. No such life has ever been verifiably observed to exist. [ 1 ] The question of whether other inhabited worlds might exist has been debated since ancient times. [ 2 ]

  5. List of alleged extraterrestrial beings - Wikipedia

    en.wikipedia.org/wiki/List_of_alleged...

    This is a list of extraterrestrial beings that have been reported in close encounters, claimed or speculated to be associated with unidentified flying objects (UFOs) (not to be confused with the meaning of the term "alien species" in the biological science of ecology).

  6. Exotheology - Wikipedia

    en.wikipedia.org/wiki/Exotheology

    The term "exotheology" was coined in the 1960s or early 1970s [1] for the examination of theological issues as they pertain to extraterrestrial intelligence.It is primarily concerned with either conjecture about possible theological beliefs that extraterrestrials might have, or how our own theologies would be influenced by evidence of and/or interaction with extraterrestrials.

  7. Outline of extraterrestrial life - Wikipedia

    en.wikipedia.org/wiki/Outline_of...

    Extraterrestrial life – is any type of lifeform, from prokaryotes to intelligent beings, that is neither native of Earth or transplanted from it. So far, no extraterrestrial life has ever been found.

  8. Extraterrestrial materials - Wikipedia

    en.wikipedia.org/wiki/Extraterrestrial_materials

    Extraterrestrial material refers to natural objects now on Earth that originated in outer space. Such materials include cosmic dust and meteorites , as well as samples brought to Earth by sample return missions from the Moon , asteroids and comets , as well as solar wind particles.

  9. History of the extraterrestrial life debate - Wikipedia

    en.wikipedia.org/wiki/History_of_the...

    The idea of extraterrestrial life, which was once a radical notion held by limited and specific people, became an accepted idea discussed in college classrooms. The change was also possible because of the changes in religious and philosophical thinking that took place at the time. [25] Besides that, there was much speculation.