posted on Feb, 27 2013 @ 11:31 AM
Originally posted by Chrisfishenstein
reply to post by muSSang
No you misunderstood me.....I never stated life is anywhere. High probability? Yes......But I am saying why does oxygen have to be present to
establish alien life can exist there?
What if they are made to breath a different way, and not use oxygen to breathe? I am just throwing that out there...
Most astrobiologists would agree with you. Life may NOT breathe oxygen. I know that Chris McKay (NASA's leading astrobiologist) agrees with you.
However, it all comes back to considering what tools we have for looking for life. Looking for certain levels/ratios of gases and elements that we
KNOW would show evidence of life
in exoplanet atmospheres is ONE tool we have to look for life. It's a tool, so we use it. It is a process
understood to us, so if we see those ratios of those gasses, we know maybe life may exist there.
What you are saying is that maybe alien life uses some other elemental gasses in their respiration processes. Maybe they do, but that's not the point
here. We don't know what those processes would be, so we wouldn't really know what to look for. At least we understand Earth's life processes enough
to look for that type of evidence.
Again, how would we recognize "life as we DON'T know it" when we see it? Could it be so foreign that we may not notice it is even life at all?
edit on 2/27/2013 by Soylent Green Is People because: (no reason given)