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Black holes can reanimate dead stars (Fun)
Posted 11 months ago by
The Carnage    
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A team of astronomers performed computer simulations to determine what happens when a burned-out stellar corpse known as a white dwarf passes close to an intermediate-mass black hole — one that harbors between 1,000 and 10,000 times the mass of our Sun.

The researchers determined that the black hole's powerful gravity can stretch and distort the white dwarf's previously inert innards so dramatically that nuclear-fusion processes can reignite for a few seconds, converting helium, carbon and oxygen into heavier elements such as iron.
Such events can also generate gravitational waves, the ripples in space-time predicted by Albert Einstein a century ago and first detected directly in 2015.


But what's a Black Hole?



Black holes are some of the strangest and most fascinating objects found in outer space. They are objects of extreme density, with such strong gravitational attraction that even light can't escape from their grasp if it comes near enough. Their gravity is so strong because matter has been squeezed into a tiny space. This can happen when a star is dying.

If light neither can escape from a black hole, it's impossible to human eye or also through special tools to see it. What scientists do, is to study how the strong gravity affects the stars and gas around the black hole.

-That's how its huge gravity can affect stars and galaxies around it.


There are two more things that feature a black hole: first of all the orizon event, which is the boundary defining the region of space around a black hole from which nothing (not even light) can escape.
In other words, the escape velocity for an object within the event horizon exceeds the speed of light. The name arises since it is impossible to observe any event taking place inside it.

Then, the gravitational singularity, in the center of the black hole, a one-dimensional point which contains a huge mass in an infinitely small space, where density and gravity become infinite and space-time curves infinitely, and where the laws of physics as we know them cease to operate.




What happens if someone "falls" in a black hole?

Current theory suggests that, as an object falls into a black hole and approaches the singularity at the center, it will become stretched out or “spaghetti-fied” due to the increasing differential in gravitational attraction on different parts of it, before presumably losing dimensionality completely and disappearing into the singularity.

An observer watching from a safe distance outside, though, would have a different view of the event.
According to relativity theory, they would see the object moving slower and slower as it approaches the black hole, because of its incredibly mass, until it comes to a complete halt at the event horizon, never actually falling into the black hole.


Just to finish, this is Sagittarius A, the massive black hole at the center of our galaxy, the Milky Way:




I hope you liked it, thanks to Jair Messias Betancourt for the support.






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USA as a world power? In E-Sim it is possible!

In E-Sim we have a huge, living world, which is a mirror copy of the Earth. Well, maybe not completely mirrored, because the balance of power in this virtual world looks a bit different than in real life. In E-Sim, USA does not have to be a world superpower, It can be efficiently managed as a much smaller country that has entrepreneurial citizens that support it's foundation. Everything depends on the players themselves and how they decide to shape the political map of the game.

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