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Has work been done on figuring out how long it would take to develop DNA/RNAthrough evolution? I.e. has the earth been around long enough?

by waheoo 6y ago

ericbarrett 6y ago
The fossil record indicates life on Earth appeared no later than about 800,000,000 years after it first formed, and possibly much sooner. While there’s no real evidence for panspermia, it is a fun topic to read about. I recall one hypothesis is that DNA (or RNA) based life evolved shortly after the Big Bang (500,000 years?) when the universe was a balmy lumpy-gas bath of 0-100C. If this were true, it would follow that life is as pervasive as the cosmic background radiation and we should expect to find it in every crevice. Mind-bending.
- ardy42 6y ago
  > I recall one hypothesis is that DNA (or RNA) based life evolved shortly after the Big Bang (500,000 years?) when the universe was a balmy lumpy-gas bath of 0-100C. If this were true, it would follow that life is as pervasive as the cosmic background radiation and we should expect to find it in every crevice. Mind-bending. That's pretty unbelievable, since at that time stars hadn't formed to create heavier elements, so the elements available were hydrogen, helium, and a little bit of lithium. DNA is mostly carbon and nitrogen.
aesh2Xa1 6y ago
Yes, there are even competing theories of DNA versus RNA as the sort of precursor self-replicating molecules. See "RNA World" and "Primordial Soup" theories. RNA makes for an interesting candidate because of enzymatic activity. Similar molecules could enzymatically consume, build, and "compete" with one another. To my knowledge, there are many computer simulations, but I don't know an exact figure for "how long would it take given X (some axiom of the state of the Earth). Here's a paper I found quickly. I promise I didn't choose that institute/university on purpose. https://www.sciencedirect.com/science/article/abs/pii/S0303264706001134 https://www.sciencedirect.com/science/article/abs/pii/S03032... The panspermia hypothesis is also supported rather recently. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6900709 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6900709

Has work been done on figuring out how long it would take to develop DNA/RNAthrough evolution? I.e. has the earth been around long enough?

by waheoo 6y ago

Has work been done on figuring out how long it would take to develop DNA/RNAthrough evolution? I.e. has the earth been around long enough?

ericbarrett 6y ago

The fossil record indicates life on Earth appeared no later than about 800,000,000 years after it first formed, and possibly much sooner. While there’s no real evidence for panspermia, it is a fun topic to read about. I recall one hypothesis is that DNA (or RNA) based life evolved shortly after the Big Bang (500,000 years?) when the universe was a balmy lumpy-gas bath of 0-100C. If this were true, it would follow that life is as pervasive as the cosmic background radiation and we should expect to find it in every crevice. Mind-bending.

ardy42 6y ago
> I recall one hypothesis is that DNA (or RNA) based life evolved shortly after the Big Bang (500,000 years?) when the universe was a balmy lumpy-gas bath of 0-100C. If this were true, it would follow that life is as pervasive as the cosmic background radiation and we should expect to find it in every crevice. Mind-bending. That's pretty unbelievable, since at that time stars hadn't formed to create heavier elements, so the elements available were hydrogen, helium, and a little bit of lithium. DNA is mostly carbon and nitrogen.

aesh2Xa1 6y ago

Yes, there are even competing theories of DNA versus RNA as the sort of precursor self-replicating molecules. See "RNA World" and "Primordial Soup" theories. RNA makes for an interesting candidate because of enzymatic activity. Similar molecules could enzymatically consume, build, and "compete" with one another. To my knowledge, there are many computer simulations, but I don't know an exact figure for "how long would it take given X (some axiom of the state of the Earth). Here's a paper I found quickly. I promise I didn't choose that institute/university on purpose. https://www.sciencedirect.com/science/article/abs/pii/S0303264706001134 https://www.sciencedirect.com/science/article/abs/pii/S03032... The panspermia hypothesis is also supported rather recently. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6900709 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6900709