What is Black hole?
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| What is black hole? |
Black holes are one among the strangest things alive.
They don't seem to form any sense in the least.
Where do they are available from? And what happens if you fall under one?
Star /star(s) are incredibly massive collections of mostly hydrogen atoms that collapsed from enormous gas cloud under their own gravity. In their core, fusion crushes hydrogen atoms into helium releasing an incredible amount of energy. This energy, within the sort of radiation, pushes against gravity, maintaining a fragile balance between the 2 forces. As long as there's fusion within the core, a star remains stable enough. Except for stars with far more mass then our own sun the warmth and pressure at the core allow them to fuse heavier elements until they reach iron.
Unlike all the weather that went before, the fusion process that makes iron doesn't generate any energy. Iron builds up at the middle of the star until it reaches a critical amount and therefore the balance between radiation and gravity is suddenly broken. The core collapses. Within a fractions of a second, the star implodes. Moving at about the quarter of the speed of sunshine, feeding even more mass into the core. It’s at this very moment that each one the heavier elements within the universe are created, because the star dies, during a super nova explosion. This produces either a star, or if the star is very large enough, the whole mass of the core collapses into a region.
If you checked out a region, what you'd really be seeing is that the event horizon. Anything that crosses the event horizon must be travelling faster than the speed of sunshine to flee. In other words, it’s impossible. So we just watch a black sphere reflecting nothing.
But if the event horizon is that the black part,
What is the "Hole" (not complete) a part of the black hole?
The singularity.
We're unsure what it's exactly. A singularity could also be indefinitely dense, meaning all its mass is concentrated into one point in space, with no surface or volume, or something completely different. Right now, we just do not know. It’s sort of a "dividing by zero “error’.
By the way, black holes don't suck things up sort of a vacuum,
If we were to swap the sun for an equally massive region, nothing much would change for earth, except that we might freeze to death, of course. What would happen to you if you fell down into a black hole? The experience of your time is different around black holes, from the surface, you seem to hamper as you approach the event horizon, so time passes slower for you. At some point, you'd appear to freeze in time, slowly turn red, and disappear. While from your perspective, you'll watch the remainder of the universe in fast forward, quite like seeing into the longer term. Right now, we do not know what happens next, but we expect it might be one among two things:
One, you die a fast death. A region curves space such a lot that when you cross the event horizon, there's just one possible direction. You’ll take this - literally - inside the event horizon, you'll only enter one direction. It’s like being during a really tight alley that closes behind you after each step. The mass of a region is so concentrated, at some point even tiny distances of a couple of centimeters, would means gravity acts with many times more force on different parts of your body. Your cells will get torn apart, as your body stretches more and more, until you're a hot stream of plasma, one atom wide.
Two, you die a really quick death. Very soon after you cross the event horizon, you'd hit a firewall and be terminated in a moment. Neither of those options are particularly pleasant. How soon you'd die depends on the mass of the region. A smaller region would kill you before you even enter its event horizon, while you almost certainly could travel inside a super-size massive region for quite a while.
As a rule of thumb, the further far away from the singularity you’re, the longer you reside. Black holes are available different sizes. There are stellar mass black holes, with a couple of times the mass of sun, and therefore the diameter of an asteroid. Then there are the super massive black holes, which are found at the guts of each galaxy, and are feeding for billions of years. Currently, the most important super massive region known, is 40 billion times the mass of our sun. It is 236.7 billion kilometers in diameter, which is 47 times the space from the sun to Pluto. As powerful as black holes are, they're going to eventually evaporate through a process called Hawking radiation.
To understand how this works, we've to seem at empty space. Empty space isn't really empty, but crammed with virtual particles popping into existence and annihilating one another again. When this happens right the sting of a region, one among the virtual particles are going to be drawn into the region, and therefore the other will escape and become a true particle. Therefore the region is losing energy. This happens incredibly slowly initially, and gets faster because the region becomes smaller. When it arrives at the mass of an out sized asteroid, it’s radiating at temperature. When it's the mass of a mountain, it radiates with about the warmth of our sun. And within the last second of its life, the region radiates away with the energy of billions of nuclear bombs during a huge explosion. But this process is incredibly slow, the most important black holes we all know, might take up a googol year to evaporate. This is often goodbye that when the last region radiates away, nobody are going to be around to witness it. The universe will became uninhabitable, long before then. This is often not the top of our story, there are loads more interesting ideas about black holes.
good article
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