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Originally posted by DarkSarcasm
I brought this up in another thread a while back.......
On earth there does not exist a precursor to the complex molecule of DNA. You can try to argue that RNA is a precursor but it is still too complex to have just formed overnight. If DNA evolved here on planet earth, then a precursor molecule would be simpler than DNA and would be found in the fossil record somewhere.
Also, amino acids are also too complex to just form without evidence of its complexity transitions along the way, wherever these two molecules came from, it is not earth.
People need to wake up and smell the coffee. Life came here from somewhere else.
Now for a bit of clarification, life as we know it is fairly specific to conditions on earth. If we were to find life elsewhere, it will almost definitely be drastically different, even at the single celled level, based on chemical makeup of the surrounding environment. Intelligent life would probably be unrecognizable due to the incredible amount of time it takes for the luck of the draw to form intelligent life. If we did somehow find intelligent that resembled humans in pretty much any way, we would have to assume that they either created us or the isolation occurred more recently. If aliens like grey were found and proven, they would have to be extremely close on an evolutionary scale and isolation would have began very recently.edit on 9-8-2011 by DarkSarcasm because: (no reason given)
It’s a pretty convincing case, though one that will undergo a lot more scientific scrutiny. If comets and asteroids really are churning out the ingredients for life, it certainly changes our picture of life in the universe, and the possibility that other rocks out there might be harboring their own biological systems.
Originally posted by clintdelicious
reply to post by kro32
I always think this is odd though, just because we need oxygen doesnt mean other lifeforms would imo. I think life can form almost anywhere using a massive variety of elements, but obviously this is hard varify! but I believe it