• crunchy@lemmy.dbzer0.com
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      4 months ago

      Methane in Earth’s atmosphere mostly come from cow farts.

      Methane in other atmospheres, as far as we know, doesn’t come from alien cow farts.

      There’s a bunch of stuff that’s made by life, but it can also be made by not-life.

    • StalinIsMaiWaifu@lemmygrad.ml
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      4 months ago

      Biosignature- signs that life was present

      Abiotic exponation- any explanation that doesn’t require life

      Exoplanet- planet outside the solar system

      Telescopes pick up light from these planets, we then analyse the light to see what elements/compounds make up their atmosphere. Say there’s a planet which has a noticeable increase in atmospheric carbon, the scientist in the meme is tempted to say it’s evidence of life (Forrest fire, industrialization, respiration), but it could be a geological process (volcanic eruption)