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  2. Life - Wikipedia

    en.wikipedia.org/wiki/Life

    Life is a quality that distinguishes matter that has biological processes, such as signaling and self-sustaining processes, from matter that does not. It is defined descriptively by the capacity for homeostasis, organisation, metabolism, growth, adaptation, response to stimuli, and reproduction.

  3. Planetary habitability - Wikipedia

    en.wikipedia.org/wiki/Planetary_habitability

    While most investigations of extraterrestrial life start with the assumption that advanced life-forms must have similar requirements for life as on Earth, the hypothesis of other types of biochemistry suggests the possibility of lifeforms evolving around a different metabolic mechanism.

  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. Habitable zone for complex life - Wikipedia

    en.wikipedia.org/.../Habitable_Zone_for_Complex_Life

    Some factors that depend on planetary distance and may limit complex aerobic life have not been given zone names. These include: Milankovitch cycle The Milankovitch cycle and ice age have been key is shaping Earth. [96] [97] Life on Earth today is using water melting from the last ice age. The ice ages cannot be too long or too cold for life to ...

  6. NASA spacecraft to study whether Jupiter's moon Europa can ...

    www.aol.com/news/nasa-spacecraft-study-whether...

    NASA is set to launch a spacecraft to Jupiter's moon Europa, considered one of our solar system's most promising spots to search for life beyond Earth, to learn whether this ice-encased world ...

  7. Extraterrestrial life - Wikipedia

    en.wikipedia.org/wiki/Extraterrestrial_life

    The Rare Earth hypothesis maintains that life on Earth is possible because of a series of factors that range from the location in the galaxy and the configuration of the Solar System to local characteristics of the planet, and that it is unlikely that all such requirements are simultaneously met by another planet. The proponents of this ...

  8. Abiogenesis - Wikipedia

    en.wikipedia.org/wiki/Abiogenesis

    Life functions through the specialized chemistry of carbon and water, and builds largely upon four key families of chemicals: lipids for cell membranes, carbohydrates such as sugars, amino acids for protein metabolism, and nucleic acid DNA and RNA for the mechanisms of heredity. Any successful theory of abiogenesis must explain the origins and ...

  9. More sex offenders would be placed on registry for life under ...

    www.aol.com/more-sex-offenders-placed-registry...

    MADISON – People convicted of multiple counts of a sex offense would be required to register as sex offenders for life, even if the counts were part of the same incident, under a bill headed to ...