So for a long time now, I've been poo-pooing the idea that life originated in shoreside tide pools, because I had adopted the opinion that life originated in deep suboceanic volcanic vents.
But it turns out that life probably formed before the ocean was even fully formed (i. e. early in the stages in which Hadean Earth was still outgassing lots of water and/or hadn't received all of its cometary intake yet), so it looks like the actual truth is somewhere in between the two ideas: lakes and ponds forming on the surface of fresh hot lava on top of barely-formed crust VERY early in the stages of cooling. It's a little like an underwater volcanic vent, and it's a little like a tidepool!
Here's an interesting paper that helped lead me to this conclusion:
Toner, J. D. and D. C. Catling (2019), A carbonate-rich lake solution to the phosphate problem of the origin of life. Proceedings of the National Academy of Sciences, 1-6. DOI: https://doi.org/10.1073/pnas.1916109117
(ETA: for those who don't know, phosphorus is needed for ATP and ADP, which all living things (yes, all) use to store and deploy energy internally, and also for RNA and DNA (yes, all), which you probably know about, and is also needed for cellular and intercellular membranes (again, yes, all such membranes in every organism) in the form of phospholipids. So, about as fundamental as carbon in its own way, but much less common than carbon. Also, it's a lot harder for stars to make than most atoms as light, for nuclear astrophysics reasons that I've read about but barely understand myself.)
And here's a youtube video that got me thinking about the whole phosphorus problem (including the problem of its nucleosynthesis), and suggests it as the resolution of the Fermi paradox:
https://www.youtube.com/watch?v=oPU9jeQbTOU
Looks as if we may have gotten over the Great Filter hump a long damn time ago. Unfortunately this means that aliens are gonna be pretty scarce, and it definitely shores up the rare Earth hypothesis (i. e. the Solar system is probably unusually enriched in phosphorus).
But it turns out that life probably formed before the ocean was even fully formed (i. e. early in the stages in which Hadean Earth was still outgassing lots of water and/or hadn't received all of its cometary intake yet), so it looks like the actual truth is somewhere in between the two ideas: lakes and ponds forming on the surface of fresh hot lava on top of barely-formed crust VERY early in the stages of cooling. It's a little like an underwater volcanic vent, and it's a little like a tidepool!
Here's an interesting paper that helped lead me to this conclusion:
Toner, J. D. and D. C. Catling (2019), A carbonate-rich lake solution to the phosphate problem of the origin of life. Proceedings of the National Academy of Sciences, 1-6. DOI: https://doi.org/10.1073/pnas.1916109117
(ETA: for those who don't know, phosphorus is needed for ATP and ADP, which all living things (yes, all) use to store and deploy energy internally, and also for RNA and DNA (yes, all), which you probably know about, and is also needed for cellular and intercellular membranes (again, yes, all such membranes in every organism) in the form of phospholipids. So, about as fundamental as carbon in its own way, but much less common than carbon. Also, it's a lot harder for stars to make than most atoms as light, for nuclear astrophysics reasons that I've read about but barely understand myself.)
And here's a youtube video that got me thinking about the whole phosphorus problem (including the problem of its nucleosynthesis), and suggests it as the resolution of the Fermi paradox:
https://www.youtube.com/watch?v=oPU9jeQbTOU
Looks as if we may have gotten over the Great Filter hump a long damn time ago. Unfortunately this means that aliens are gonna be pretty scarce, and it definitely shores up the rare Earth hypothesis (i. e. the Solar system is probably unusually enriched in phosphorus).