+Grim Reaper 6 Posted May 14, 2022 #26 Share Posted May 14, 2022 5 hours ago, astrobeing said: First thank you very much for the reply to my previous comments on how life began ( In my opinion it’s very difficult to believe that life is so rare in a Universe filled with the same chemical components that allowed life to begin and thrive on Earth, or planets that can support some form of life are rare) we’re certainly not an in depth example of the process so let me clear this up. I am a very firm believer in the Panspermia Theory and that early Earth was seeded with the building blocks of life from space. Between 4.5 billion years ago and 4 billion years ago the Earths surface was a sterile blank slate, do to the high temperatures of the Earths creation. When Earths surface cooled to a point where liquid water could remain on the Earths surface which approximately occurred 500 Million years after the planets formation ( approximately 4.5 billion years ago ) this was the first step toward the formation life! Currently, the most favored explanation for where the early Earth got its water is that it acquired it from water-rich objects (planetesimals) that made up a few percent of its building blocks. These water-rich planetesimals could have been both comets and asteroids in addition to the water that arrived with them, they also brought a number of chemical compounds. This primordial debris included ammonia, carbon dioxide and organic molecules such as amino acids, amphiphiles and nucleobases—the building blocks of proteins, cell membranes and RNA and DNA, respectively. The earliest life forms that existed on Earth we know of at this time were microscopic organisms (microbes) that left signals of their presence in rocks about 3.7 billion years ago. Approximately 3.5 billion years later more complex life forms developed from microscopic organisms in shallow bodies of water. Evidence of these microbes was preserved in the hard structures ( Stromatolites ) which they made, and also which date to 3.5 billion years ago. Stromatolites were created as sticky mats of microbes that trap and bind sediments into layers. Minerals precipitate inside the layers, creating durable structures even as the microbes die off. In fact Stromatolites are the oldest living structured life’s forms still alive on Earth today. 5 hours ago, astrobeing said: I don't think my confused. These chemicals didn't just appear out of nowhere. They were generated through events. If you study the history of Earth you'll find that it went through several changes that allowed the creation of life, and most importantly, prevented its destruction. See above! 5 hours ago, astrobeing said: Yes, read this paper!!! Each theory (and they are just theories) clearly describes a long series of extremely unlikely events and conditions. As you know the likelihood of a series of events is the product of all its probabilities so the end result is gigantically improbable. I don’t believe these events or conditions are extremely unlikely and neither do biologists and astrobiologists do to the vast size of our Universe. As far as probabilities are concerned there's one thing we can be sure of in this entire series of unlikely events, that occurred one after the other, nothing that occurred at any point had an infinitesimal likelihood. Instead, every single event, including the creation of life here on Earth does not have a infinitesimal likelihood of occurring over and over again according to Bayes' theorem, across our Universe according to mathematical probabilities. This mathematical idea is devastatingly simple, but its consequences are incredibly complex and it has far reaching concepts. On its own, Bayes' theorem is simply a rule to tell you the probability that something is true, given knowledge of conditions that are related to the thing you're trying to measure and the time allowed for a reoccurrence. 5 hours ago, astrobeing said: This huge paper also leaves out many many other critical factors, like what was needed to keep life from destruction. Well it did touch on bombardment but didn't acknowledge how fortunate that bombardment stopped because it would have exterminated all early life. There easily could have been an event that changed Earth's environment enough to wipe out all life. Somehow Earth avoided this. It also didn't include a fundamental problem of life: it consumes all resources and dies. This nearly led to the destruction of all life on Earth two billion years ago. Unfortunately getting from life to an intelligent civilization is vastly more complicated topic than what that paper described. If things had gone differently, Earth could still be inhabited by unintelligent dinosaurs right now with no intelligent beings anywhere. I will add this as food for thought, it may interest you or it may not. Well what many people fail to realize is that when early biogenesis events first occurred on Earth carbon based life may not have been the only the life forms to occur. While this is theoretical there is a current hypothesis that non-water based life may have originally existed side by side with water based life, and died out as conditions on Earth changed because of the oxygen rich atmosphere that developed. In the beginning oxygen was poison the life forms that first began developing on Earth The basis for this theory has resulted from scientific studies and simulations being carried out concerning Saturns moon Titan. Titan is the only object in our solar system besides Earth, that presently has both rainfall and erosion due to liquid movement. But the water it has is locked far underground and the moon is too cold to support an impact from water anyway. Researchers have discovered after poring over data sent back by Huygens, the surface does have hydrogen cyanide in its sediment, brought down from the atmosphere by methane and ethane rain. these molecules are that drove the design of the simulations—the researchers wanted to see if they could form the basis of reactions that could lead to the creation of polymers such as polyimine. Which the researchers note are conducive to the formation of prebiotic reactions leading to a formation of life. The simulations showed that such reactions are possible and that the structures that came about were also able to absorb sunlight in the wavelengths present on the Titan surface. This has prompted researchers to suggest their work, and that done by others indicates that a return to the planet by a new probe might be in order, one able to test for a different form of life, or at least its precursors. I hope I have better explained my thoughts on the subject than I did previously and I hope this doesn’t create further confusion. Be well Astrobeing. 1 Top Link to comment Share on other sites More sharing options...
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