Originally posted by ZeskoWhirligan
Originally posted by MrInquisitive
Also, flinging microbe-laden rocks off a planet relies a lot on random factors: how could they be flung just to the right solar system, and then get to just the right planet or planetoid in said system?
What is "the right system," and what is "the right planet"...?
What we know about bacterial Life on Earth is that it apparently just sprang into existence about 500 million years after the planet had formed; indeed, it was as if bacterial life was seeded to an otherwise hostile and sterile world. In those earliest days of Earth's formation, the atmosphere and hydrosphere were chemically toxic to all Life as we know it today. No Life that we know today would have survived on the primordial Earth.
Yet SOME SORT of bacterial Life rapidly infested the Earth's poisonous oceans 3.5 BILLION years ago. That bacterial infestation eventually CHANGED Earth's environmental chemistry, making the planet more hospitable to higher life forms.
This is what I mean by engineering bacteria to seed other worlds. I'm not talking about bacteria that require a friendly medium in which to survive and thrive... I'm talking about a bacterium that is so tenacious that it can enter an utterly toxic environment and eventually alter that world into a more hospitable environment.
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See, I think a Creator Species could, quite literally, bio-engineer such an all-purpose bacterium and cast handfuls of these "seeds" into the cosmos, and that Life would find a way to re-engineer the atmospheres and hydrospheres and land masses of ANY comet or planet it encountered.
We know that this is what happened on Earth — a poisonous little orb was transformed by Life into a lush garden planet. It may have happened on Mars. It may have happened on EVERY planet in our known Solar System, and we have YET to discern the fact.
FTR, by "right" planet/solar system, I mean one on which microbes (by which I mean primitive bacteria and/or viruses) from earth could exist and reproduce -- and with time evolve and thrive there while transforming the environment. I doubt one primitive bacterium or other microbe could take root on each and every planet, planetoid and/or comet it might encounter. That is why I use the term "right". Primordial earth did have the organic molecules and temperature in order for life to start up. I can imagine planets where this might not be the case or that other environmental factors may preclude the development of organic life as we know it. Now maybe there are other forms of life possible in other environments -- say silicon based, for example. My point being that there may not be a all-purpose primitive bacterium that can live and take root in all environments.
Some of these flung stones or other vessels, even if they reach a distant solar system, might just get sucked into the star there, hit a distant outer planet in which life will never have the conditions to develop, or be trapped in outer orbit or in outer space. Whereas intelligently guided space vessels that can get their cargos to best-candidate planets are going to be more effective at spreading life than the haphazard stone-flinging method.
Your proposed methodology could work, but to dismiss more guided missions using artificial intelligence seems to be dismissive of a not unreasonable alternative.

