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Astrophysics/How long has the Universe been capable of supporting life?


How long has the Universe been capable of supporting life like our biosphere has? I mean like when did the first stars evolve that had created the elements like iron, etc... and when in generally did the Universe fit our Earthly standards of habitability?

Quickly, in fact.  The thing is, the regions which can support life like on Earth have been expanding since the first few stars exploded and left material to make planets from.  That process would've taken billions of years, to boot, so it can't have been more than about 10 billion years that the universe could've created planets capable of habitability.  At that point, there were probably very few places in the universe with planets still, but some would've been right.  In the 10 billion years since, that number has expanded drastically!


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Dr. Stephen O. Nelson


Fusion, solar flares, cosmic rays, radiation in space, and stellar physics questions. Generally, nuclear-related astrophysics, but I can usually point you in the right direction if it's not nuclear-related or if it's nuclear but not astrophysics.


Just moved from being a physics professor at the University of Texas of the Permian Basin into government work. Doctoral dissertation was on a reaction in CNO-cycle fusion, worked in gamma-ray astronomy in the space science division of the naval research laboratory in the high-energy space environment branch.

Government work as a physical scientist with a nuclear focus.

Ph.D. in physics, research was on nuclear fusion reactions important in stellar fusion, further work on space telescope technology.

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