UM-Bot Posted September 28, 2017 #1 Share Posted September 28, 2017 Scientists have made a discovery that could push back the emergence of life further than ever before. http://www.unexplained-mysteries.com/news/311990/life-may-have-emerged-over-4-billion-years-ago 2 Link to comment Share on other sites More sharing options...
MissCalamity Posted September 28, 2017 #2 Share Posted September 28, 2017 1 Link to comment Share on other sites More sharing options...
bison Posted September 28, 2017 #3 Share Posted September 28, 2017 The further back in time the origin of life on Earth, the more inevitable life appears to be throughout the rest of the universe. The ease and rapidity with which life seemed to begin on Earth, even under conditions very different, and much less favorable than those that exist today, the more frequently it can be expected to exist on other worlds. 1 Link to comment Share on other sites More sharing options...
paperdyer Posted September 28, 2017 #4 Share Posted September 28, 2017 Or at least life existed elsewhere. You'd think by now we would have "heard" or "seen" something to indicate a sentient species somewhere other than here. Perhaps they aren't as far in the development stage as we or they wiped themselves out as we keep threatening to do or something wiped them out or they are just ignoring us. If they are. you can't really blame them. 1 Link to comment Share on other sites More sharing options...
bison Posted September 28, 2017 #5 Share Posted September 28, 2017 We haven't been particularly good at hearing or seeing signs of intelligent life at stellar distances, until very recently. We're getting better at this, all the time, but still have a lot of combinations of radio and optical frequencies, sky directions, power levels, modulation schemes, schedules of transmission, etc., to explore. Dr. Jill Tarter, of the SETI Institute has likened this to dipping a glassful of water out of the ocean, finding no fish in it, and concluding that there are no fish in the ocean. 3 Link to comment Share on other sites More sharing options...
pallidin Posted September 29, 2017 #6 Share Posted September 29, 2017 Good comments to an admittedly difficult topic. 1 Link to comment Share on other sites More sharing options...
spud the mackem Posted September 29, 2017 #7 Share Posted September 29, 2017 We keep reading that life started futher and further back but in real terms they haven't a clue when life started or how it started so all these theories are guesswork by guys who have nothing better to do. 2 Link to comment Share on other sites More sharing options...
Peter B Posted September 30, 2017 #8 Share Posted September 30, 2017 On 9/29/2017 at 3:52 PM, spud the mackem said: We keep reading that life started futher and further back but in real terms they haven't a clue when life started or how it started so all these theories are guesswork by guys who have nothing better to do. Well, scientists have more than a clue about when life started, as the article linked in the OP indicates, partly because of other factors such as the timing of the Late Heavy Bombardment. Sure, there aren't yet any clear answers about how life started, although there are a few theories. And these theories provide ideas about what the earliest evidence for life would look like. So it's wrong to say it's "guesswork" - they're making educated guesses. Dating rocks, for example, is these days a fairly uncontroversial part of palaeontology, so scientists can usually provide reasonably narrow limits for dating fossils or other things. As for the "guys who have nothing better to do", would you care to explain what that's about? Link to comment Share on other sites More sharing options...
Ogbin Posted October 3, 2017 #9 Share Posted October 3, 2017 (edited) Was the Sun able to emit enough energy for Earth to sustain life 4 billion years ago? Edited October 3, 2017 by Ogbin Link to comment Share on other sites More sharing options...
spud the mackem Posted October 3, 2017 #10 Share Posted October 3, 2017 15 hours ago, Ogbin said: Was the Sun able to emit enough energy for Earth to sustain life 4 billion years ago? I am only guessing but I would think that the Sun was much warmer 4 billion years ago, and the atmosphere would be nothing like it is today. Link to comment Share on other sites More sharing options...
+Noteverythingisaconspiracy Posted October 9, 2017 #11 Share Posted October 9, 2017 On 3/10/2017 at 7:05 PM, spud the mackem said: I am only guessing but I would think that the Sun was much warmer 4 billion years ago, and the atmosphere would be nothing like it is today. Actually the Sun was cooler in the beginning of the solar system, something like 70% of today, but as you say the Earths athmosphere was different back then and contained a lot more CO2 than today, and that would have helped to keep the Earth nice and warm. The Earth didn't have a breathable athmosphere until about 600 million years ago. 1 Link to comment Share on other sites More sharing options...
Mike Lansing Posted October 9, 2017 #12 Share Posted October 9, 2017 There are more clues than that. The Miller-Urey volcanic spark experiment of 1959 was reproduced at Livermore Labs. The first amino acids were, in order of abundance, especially dominated by glycine and beta-cyanoalanine. Glycine has unique folding capabilities, and the cyano moiety certainly contributed to oxygen-free respiration in these organisms. Proteins folding on the crusty edge of a volcano translates the geography precisely to the target zone: www. for "The Volcanic Margins of the Northern Labrador Sea: Insights to the Rifting Process." Link to comment Share on other sites More sharing options...
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