Posted on 05/22/2017 9:32:26 AM PDT by MtnClimber
It's hard to imagine, given the full diversity of forms that matter takes in this Universe, that for millions of years, there were only neutral atoms of hydrogen and helium gas. It's perhaps equally hard to imagine that someday, quadrillions of years from now, all the stars will have gone dark. Only the remnants of our now-vibrant Universe will be left, including some of the most spectacular objects of all: black holes. But even they won't last forever. David Weber wants to know how that happens for this week's Ask Ethan, inquiring:
What happens when a black hole has lost enough energy due to hawking radiation that its energy density no longer supports a singularity with an event horizon? Put another way, what happens when a black hole ceases to be a black hole due to hawking radiation?
In order to answer this question, it's important to understand what a black hole actually is.
Black holes generally form during the collapse of a massive star's core, where the spent nuclear fuel ceases to fuse into heavier elements. As fusion slows and ceases, the core experiences a severe drop in radiation pressure, which was the only thing holding the star up against gravitational collapse. While the outer layers often experience a runaway fusion reaction, blowing the progenitor star apart in a supernova, the core first collapses into a single atomic nucleus — a neutron star — but if the mass is too great, the neutrons themselves compress and collapse to such a dense state that a black hole forms. (A black hole can also form if a neutron star accretes enough mass from a companion star, crossing the threshold necessary to become a black hole.)
(Excerpt) Read more at forbes.com ...
An interesting article.
He moves back to Kenya?
Lol! Might just be the post of the year!
Is this a parable on the crypto-moslem unAmerican
lying phoney, without so much as a real SS#, Obama?
“It’s a warm summer’s evening ....’
“It was a dark and stormy universe...” ‘Twas brillig, and the slithy toves Did gyre and gimble in the wabe; All mimsy were the borogoves, And the mome raths outgrabe.
Is this the bio of Brittany Griener?
You've reawakened old memories; thanks
Bazinga!
A five million megaton explosion in the last second of evaporation. Is that something we can use against ISIS?
“In order to answer this question, it’s important to understand what a black hole actually is.”
a fiction
When all that’s left is Black Holes, and then eventually they ALL merge together back into the primordial mass that began as ‘The Universe’, there will be light.
And we shall look upon that light, and see that it is good..................
She gets a new job?
The Toves must be smeared with vaseline
first in order to be made slithy or the
whole thing doesn’t work.
It gets self-conscious about appearing too similar to other black holes? Starts wondering if it should change its' name to "Jamu?"
LMAO!
Man, the momely wraths are gonna get you!
“In order to answer this question, it’s important to understand what a black hole actually is.”
a fiction
Absolutely!
Having no direct observation of one, everything else
is conjecture.
Might as well be the source of global warming...
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