scowl, on 08 February 2012 - 01:01 AM, said:
One idea I like is the theory of molecules collecting molecules until they get so large that they split, then the process starts again. This is sort of a form of life that wouldn't involve making perfect copies like the DNA/RNA system.
That doesn't sound very life-like to me. But I suppose since you don't see it you take this to mean life in the universe must be rare.
scowl, on 08 February 2012 - 01:01 AM, said:
Of course you wouldn't, because neither of us know what that process was or all the things that were necessary for it to happen.
Right just as I don't know exactly how supernovas produce PANH's. Who's to say that process of Molecule formation doesn't go further and arrange these into simple life that wafts around in the interstellar dust until Star systems form?
scowl, on 08 February 2012 - 01:01 AM, said:
Have you looked around the solar system? Life is not common.
What is that supposed to mean? Have you 'looked around' and been able to determine simple life isn't present in the solar system?
scowl, on 08 February 2012 - 01:01 AM, said:
But if life wasn't hardy here, you wouldn't be here to say that. Just because something happened once doesn't mean it will ever happen again.
My point is that life is hardy by nature. Carbon based life elsewhere will be hardy by nature as well.
scowl, on 08 February 2012 - 01:01 AM, said:
Please tell me how this "erosion" turns my waste products back into resources that will sustain life.
I didn't say erosion turns waste into resources, plate techtonics does that.
scowl, on 08 February 2012 - 01:01 AM, said:
Mars does not have a carbon cycle. All of its carbon is now trapped and is going nowhere. Anything that may have relied on it is now dead.
Carbon out gasses from the mantel, yes this will eventually stop but here we are 4.6 billion years after the solar system formed and the carbon is still out gassing.
scowl, on 08 February 2012 - 01:01 AM, said:
The methanological cycle on Titan has nothing to do with life. It is just circulation of methane just like water circulates on Earth. It is never converted to other chemicals as it would be if a life form were consuming it as a resource. You're confusing types of cycles. The carbon cycle on Earth which life relies on is a chemical cycle.
Plate techtonics on exoplanets that do devolpe life will insure a carbon cycle. That's hardly the miraculous event that you are suggesting this would be.
Whoever fights monsters should see to it that in the process he does not become a monster. And if you gaze long enough into an abyss, the abyss will gaze back into you. - Friedrich Nietzsche