Are Non-Carbon Based Life Forms Really Possible?

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Discussion Overview

The discussion centers around the possibility of non-carbon based life forms existing in the universe, exploring various hypotheses about their potential existence, characteristics, and evolutionary processes. Participants consider theoretical frameworks, implications for life beyond Earth, and the nature of life itself, including comparisons to carbon-based life forms.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants propose that non-carbon based life forms, such as silicon or fluorine-based organisms, could exist but express skepticism about their complexity or advancement.
  • Others argue that life evolves to fill available niches, suggesting that non-carbon life could emerge in environments unsuitable for carbon-based life.
  • A participant claims that carbon life forms could eventually give rise to non-carbon life forms, emphasizing the fluidity of life and evolution.
  • Concerns are raised about the stability and viability of alternative biochemistries, with some asserting that carbon is the most suitable element for life.
  • One participant suggests that intelligent carbon-based life forms could create non-carbon life forms, which would also be considered part of nature.
  • Disagreement exists regarding the definitions and implications of "best" materials for life, with some advocating for the potential of metal-based life forms in specific environments.
  • Several participants express uncertainty about the emergence of non-carbon life forms and the conditions necessary for their development.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the likelihood or nature of non-carbon based life forms. There are multiple competing views regarding their feasibility, evolutionary potential, and the relationship between carbon and non-carbon life.

Contextual Notes

Participants highlight various assumptions about environmental conditions, the definitions of life, and the evolutionary processes involved. The discussion reflects a range of perspectives on the nature of life and the potential for different biochemical systems.

  • #31
theForthD? said:
Saying that really restricts how your mind can think.

As it's supposed to. Science is about restricting the number of things you need to look at to only relevant models - and by relevant I mean "agrees with the data".

We know that the atomic and molecular spectra are the same from stars and gas clouds in other galaxies as they are here. That's very powerful evidence that they are the same as here.
 
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  • #32
Well, these are the folks actually looking for exobiology:
http://astrobiology.nasa.gov/documents-and-reports/
and this is what they are hoping to find:
http://books.nap.edu/catalog.php?record_id=11919#toc

NASA is considering all possibilities and the search is no longer Earth-centric/carbon only.
 
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  • #33
I think it falls to the fact carbon is so much more reactive than silicon that in any environment that would support silicon life it would also support carbon life. Natural processes tend to the path of least resistance the chances of silicon based life are extremely low. As for filling a niche I think we are just beginning to see the extremes that carbon based life can survive. Look at Extremophiles, carbon based organisms that not only survive at temperatures grater than 100 C but flourish, or in a environment with a PH>3, or my favorite are radio resistant bacteria organisms capable of resisting nuclear radiation.
 

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