What are blackholes? What would happen if you go inside one ?

What are Blackholes ?

Black holes are the most powerful and extreme things in the universe and are wonderfully weird and complicated. So, First we need to talk about space and time. Space and time are the grand stage where the play of the universe unfolds. But space isn't a fixed stage and time isn't same for everyone everywhere and they are relative. Matter of space and event space tells matter how to move but some stars and planets on the stage and insects underneath. That's misshapen stage we don't it's little more some tips gives this gravity. Black holes do not just bend the stage, but they are like trap doors, places with so much mass that the universe formed a 'no go' zone where the rules change. Most black holes form when very massive stars die. All you need to know now that in the final moments of massive stars, their insides implode, at nearly a quarter of the speed of light. This packs so much, mass so close together creating something so dense that it sort of breaks the stage of the universe. The black hole with 10 times the mass of the sun would be barely 60 kilometers across. 

How do they look ?

If you look directly at a black hole it looks like nothing. The space under that control is blocked by an invisible one way border the event horizon. The event horizon forms a shell around a region of space that once entered is shielded from the rest of the universe forever. Because the black cold front door deforms space so much that not even light can escape it, and with nothing can escape it. And nothing escaping to transfer information from the inside it's impossible to tell what it really looks like. 

We can still observe blackholes because of their effect on massive things can orbit black holes just as they can orbit the sun or planets. Many black holes have disks of matter orbiting outside the event horizon. This matter become incredibly hot as close orbits can speed this matter up to half of the speed of light, and tiny amounts of friction and collisions between particles keep them to a billion degrees, making the space around these black holes ironically incredibly bright.

Real picture of Black hole

So what does await there for you ?

What would happen if you were to try to get closer or even inside a black hole. First of all, you will see the strangest funhouse mirror in the universe. Matter isn't the only thing orbiting a black hole; gravity is so strong near them that light can orbit too. If you hovered just outside the event horizon, at the photon sphere, in any direction you just see yourself. Straight ahead would be the back of your own hands as light from your back travels around the black hole to your eyes. Gravity also is the passage of time itself. The stronger the gravity slower the time passes. While you watch the universe above you speed up, those far away will watch you in slow motion. If you chose to fly away from the black hole you might find that eons have passed for the rest of the universe, a freakish one way time travel trip to the future where your loved ones are long dead. 

Getting close to a black hole can be incredibly dangerous. The painful death by ‘sphagettification’ awaits you because your feet are closer to the black holes than your head, they feel a stronger pull of gravity, enough to pull your body apart. As you descend it gets worse, the pulling gets stronger, your body squeezed and straighter until you've been reduced to a thin stream of hot plasma, gobbled up in one final slurp, never to be seen again. 

Sphagettification

Spaghettification is only a risk with smaller black holes since they have much smaller radii. If you go to the centre of a galaxy and find a supermassive black hole you might be able to experience crossing the event horizon. As you approach the event horizon, a distant observer would think they never saw you enter it, seeing you stop and fade. The last light you emit trickling up and out, away from the event horizon. Meanwhile, from your perspective the void of the black hole rises up to meet you as light from a few directions can reach you. Only view of the universe you left is a tiny spots of light.

Here, inside the event horizon space and time also horribly broken the real time travel is possible. So it's probably a good thing that nothing gets out. If anything could escape it could create all sorts of time travel paradoxes and issues that break the universe as scary as the event horizon is, it keeps us safe from that drama. Whether do you have survived this long doesn't really matter, as now there's only the certainty of crushing death in your near future. Inside the event horizon, spacetime itself is so bent and warped that whatever direction you move here, every “forward” you go, leads only towards the center of the black hole. Trying to go in any direction only brings you to the centre faster. To survive the longest, you must do nothing. 

Some facts that won't matter for some more centuries

In the centre of the black hole, we find the singularity a single point with all the matter that has ever crossed the event horizon all crushed to a point infinitely small. There is no memory of the things that made it as stuff disappears down the black hole trap door forever. 

The singularity makes all things equal. This actually breaks the universe in ready cool ways. In a nutshell everything that comes to close becomes a black hole matter, concentrated at the singularity. This lack of a memory of its past means that a black hole has only 3 properties: i.e mass, spin and electric charge. Everything else is lost. They're a lot like fundamental particles in that respect. This actually means that every single black hole in the universe is the same, sure that mass is different and some spin faster than others but if we were to put all the singularities into a magical physics museum they'd be identical like electrons. But just like fundamental particles the properties of singularities are the best ways we can describe them on paper, rather than an accurate representation of reality. 

Our current theories about the universe namely general relativity are just not able to describe or explain blackhole. The curvature of space becomes infinite density becomes infinite and our rules just don't make sense. The singularity has no surface or signs something like a divide by 0, i.e. error in the universe. The singularities might not even exist or will be completely different things but this is all we know right now from the best prediction we have from our best current theory of space time. Also basically everything you've ever heard about black holes even in this article is about theoretical black halls that aren’t spinning, because their maths is so much easier. 

But since black holes were born from dying stars that was being extremely quickly in those final moments as far as we know black holes in the universe should be spinning right now that's incredible speeds to up to 90 percent of the speed of light this means that in reality black holes are even more screwed up than they usually get credit for. The singularities of rotating black holes are even wilder. The rotation causes them to swell outwards into a sort of regularity. This rotation is so powerful, that space itself is dragged along. This creates another region around spinning black holes, called Ergosphere where it's impossible to stay still no matter how hard you try. Like a rushing whirlpool of space time, the tide is irresistible and the black hole makes you orbit it whether you want to or not. 

Ergosphere and Ringularity