Whatever answers you get here, I feel like this would be a good question for XKCD’s “What If?” series, if he still does those.

Let me recommend you a youtube channel: "But Why?" They will be able to answer this question better than I ever will, but their video essentially says that objects are not as we see them, they are billions of molecules bonded in a manner that is the object in our hand. However, fundamentally, everything is just that, molecules. So when the string would cross the event horizon, the entire string would not be sucked in, but all that has crossed the event horizon would undoubtedly be gone forever. The molecules that composed that part of the string have lose their bond to the object, and are now destined to fall into the singularity.

I do recommend the channel, though. He has a video where he asks this very question, although I don't remember which one it is.

Basically to an outside observer, you'll never see it enter the blackhole.

Time at the event horizon from a distant perspective is basically frozen.

The "glow" around the black hole, or the event horizon, is basically our view of everything falling into it, but from the perspective of whatever is falling in, it has already been consumed.

That's not entirely accurate, as it will technically stop being visible to an outside observer eventually, but we're talking an insanely long time period so you wouldn't be able to watch it happen

There is no such thing as an infinitely strong string. If we do have access to infinitely strong string then there's no telling what other physics-defying stunts we'll be able to pull, so I vote maybe we can pull the thing out of the black hole with our infinitely strong, infinitely long string that passes through an infinite number of pulleys that multiply any input force by infinity. So actually even a child could pull stuff out of the black hole.

Basically you need to jot this down: through God all things are possible

As objects approach the black hole (event horizon), they speed up to near the speed of light. At which point, their mass is greatly increased.

Basically you would need an impossible amount of energy to pull anything out of a black hole, if it were hypothetically possible.

This was already posted.

Anything that crosses the event horizon is gone.

The event horizon is the boundary of no return. Once past, that's it.

In addition, depending on the size of the black hole and the tidal forces involved, whatever gets sucked in could be spaghettified. Basically, it gets ripped apart.

"Infinitely strong" anything is probably going to collapse into a black hole itself when you try to apply physics to it.

This video explains it very well.

Your object isn't a unified object. But these are all theories. The part of the object passing the event horizon would either split apart from the atoms not in the event horizon or explode. But no-one can really truly know.

Okay.

Technically, yes. If you wait a finite amount of time, and use several observable universes worth of energy to pull it out, you could. Whatever object would have to survive a lot of radiation.

But yeah, sure. Kinda. But it never crossed the event horizon.

The moment it crosses, physics doesn't work, and the object isn't an "object" anymore. It goes to a place where time and space swap places and it takes an indefinite amount of time to reach there. One of my amateur theories on the matter is that objects don't cross the event horizon, the event horizon "reaches up" to engulf objects at it approaches the black hole. There's not enough time in the universe for objects to pass the event horizon.

Now, if you wait until the CMB is colder than the black hole's hawking radiation, you might be able to see the energy of your object become hawking radiation, and when you pull your string, you get just the string. Pulling the string would still require the energy of observable universes.

I thought anything entering a black hole would get immediately torn apart like spaghetti.

Hmm... If my understanding of our best theory to date is correct (and the theory is correct), you probably cannot pull it back, as the direction "back" no longer exists as you pass the event horizon.

In reality the line would snap.

I think by definition of event horizon the answer would be no.

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Whatever the other end of the string is attached to will head into the black hole

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Hello u/Cthaeh420, your submission "What if an object crosses an event horizon of a black hole..." has been removed from r/space because:

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This has to be a bot or this question is coming from a social media platform of some kind because it keeps getting asked.

It’s stuck in the universe on the other side of the event horizon, just like you’re stuck in this universe and can’t get back to the other side of the black hole you came through at the Big Bang. Everyone who says I’m wrong can’t explain why the math agrees, and the math and physics of a specifically sized black hole roughly matches the math and physics of the observable universe, where anything passing into the black hole across the event horizon would simply speed up past the speed of light and would not be destroyed. You simply have to understand the math of inside a black hole and turn that infinity sideways so that the multiple dimensions of time become the proper multiple dimensions of space and time in the newly formed universe. Seriously, just do the math and say it’s wrong.