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| | Water and life
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Lightning is a dramatic display of electrical power, but it is also sporadic and unpredictable. Even on a volatile Earth billions of years ago, lightning may have been too infrequent to produce amino acids in quantities sufficient for life â a fact that has cast doubt on such theories in the past, Zare said.
Water spray, however, would have been more common than lightning. A more likely scenario is that mist-generated microlightning constantly zapped amino acids into existence from pools and puddles, where the molecules could accumulate and form more complex molecules, eventually leading to the evolution of life.
âMicrodischarges between obviously charged water microdroplets make all the organic molecules observed previously in the Miller-Urey experiment,â Zare said. âWe propose that this is a new mechanism for the prebiotic synthesis of molecules that constitute the building blocks of life.â
However, even with the new findings about microlightning, questions remain about lifeâs origins, he added. While some scientists support the notion of electrically charged beginnings for lifeâs earliest building blocks, an alternative abiogenesis hypothesis proposes that Earthâs first amino acids were cooked up around hydrothermal vents on the seafloor, produced by a combination of seawater, hydrogen-rich fluids and extreme pressure.
Yet another hypothesis suggests that organic molecules didnât originate on Earth at all. Rather, they formed in space and were carried here by comets or fragments of asteroids, a process known as panspermia.
âWe still donât know the answer to this question,â Zare said. âBut I think weâre closer to understanding something more about what could have happened.â
Though the details of lifeâs origins on Earth may never be fully explained, âthis study provides another avenue for the formation of molecules crucial to the origin of life,â Williams said. âWater is a ubiquitous aspect of our world, giving rise to the moniker âBlue Marbleâ to describe the Earth from space. Perhaps the falling of water, the most crucial element that sustains us, also played a greater role in the origin of life on Earth than we previously recognized.â | | | | Forrest (Visitante)
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| | Water and life
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Lightning is a dramatic display of electrical power, but it is also sporadic and unpredictable. Even on a volatile Earth billions of years ago, lightning may have been too infrequent to produce amino acids in quantities sufficient for life â a fact that has cast doubt on such theories in the past, Zare said.
Water spray, however, would have been more common than lightning. A more likely scenario is that mist-generated microlightning constantly zapped amino acids into existence from pools and puddles, where the molecules could accumulate and form more complex molecules, eventually leading to the evolution of life.
âMicrodischarges between obviously charged water microdroplets make all the organic molecules observed previously in the Miller-Urey experiment,â Zare said. âWe propose that this is a new mechanism for the prebiotic synthesis of molecules that constitute the building blocks of life.â
However, even with the new findings about microlightning, questions remain about lifeâs origins, he added. While some scientists support the notion of electrically charged beginnings for lifeâs earliest building blocks, an alternative abiogenesis hypothesis proposes that Earthâs first amino acids were cooked up around hydrothermal vents on the seafloor, produced by a combination of seawater, hydrogen-rich fluids and extreme pressure.
Yet another hypothesis suggests that organic molecules didnât originate on Earth at all. Rather, they formed in space and were carried here by comets or fragments of asteroids, a process known as panspermia.
âWe still donât know the answer to this question,â Zare said. âBut I think weâre closer to understanding something more about what could have happened.â
Though the details of lifeâs origins on Earth may never be fully explained, âthis study provides another avenue for the formation of molecules crucial to the origin of life,â Williams said. âWater is a ubiquitous aspect of our world, giving rise to the moniker âBlue Marbleâ to describe the Earth from space. Perhaps the falling of water, the most crucial element that sustains us, also played a greater role in the origin of life on Earth than we previously recognized.â | | | | Kerstin (Visitante)
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