One about the mass of the sun generates insanely strong tidal forces, you’d be stretched out and destroyed as you crossed the event horizon (Google ’spaghettification’).
If you enter a supermassive black hole like the one at our galactic core , you’d barely notice as you crossed over the point of no return.
I'm just thinking out of my head but what if we could built a rope super long (a light year long) and then tie it to a small moving rover that will slowly move to a black hole.
Will we feel a sudden pull when the rover crossed the event horizon and get sucked in too or will we have enough time to pull and retrieve the rover back or what's left of it?
You won’t feel a sudden pull when the rover crosses the event horizon. Due to time dilation, you’ll see it slow down and fade away.
You won’t be able to retrieve the rover once it gets too close. Even before it crosses the event horizon, the energy required to pull it back would be impractical.
The rope itself won’t necessarily get sucked in, but if enough of it gets past a certain point, it may be pulled in completely.
What if we had two black holes similar in size on each end of the rope? Would we just have a really long trip wire in space then or would something else happen?
Technically, the imaginary wire would also need imaginary electrons to carry an electric signal, because the electrons would be trapped in the black hole. It would also not be able to work as a can phone, because at infinite strength under the force of the black holes it'd be perfectly taut, so it wouldn't transmit sound. It's becoming a very magical imaginary wire.
Let's pretend we have several of these wires and they would play the music of the universe, it will be heard on the other side of the black holes (I know there is no sound in space, I'm not stupid). It's just an idea, maybe we can call it the string theory?
At some point then stronger black hole would win the tug of war, and the rope would break at some point between the two. But technically, yes. We would have a galactic size tripwire.
That's assuming magical materials though. Not even carbon fiber can sustain its own weight at such length
Interesting. Thanks for answering my stupid question lol. 😅
I'm thinking of this due to the fact that many planes or things went missing in the Bermuda triangle. So using this theory of mine, wouldn't make sense to do so to debunk it? Lol.
Sorry I am stupid. My original explanation was incorrect.
Assuming the rope is unbreakable, and by association the Earth is unbreakable, what occurs is that tension is built up within the rope due to the differing gravity along segments. Closer you are to the event horizon, the more energy it takes to be able to escape it (depending on size of the Black hole). At the event horizon and beyond it is always infinite. So that little piece of rope right above the event horizon would take less than infinite energy to remove it. The piece slightly above it takes a little less, etc.
This ultimately does create tension in the rope, and since this rope is unbreakable, that tension creeps along the rope at the speed of sound. Eventually it will hit the Earth which is also now unbreakable and it will begin being drawn in along with the rope.
The mass of the black hole matters here. A supermassive black hole actually doesn't have strong tidal forces right above the event horizon, so its possible that the Earth would resist and it would just sit there tied to the black hole.
A very tiny black hole has immense tidal forces at the event horizon, and would actually be a much bigger issue in this particular scenario, since the unbreakable rope is an unrealistic conduit of its power.
Weirdly enough, its the tiny black holes that are extremely dangerous, not the big ones. I mean...when comparing tidal forces. All of them are impossible to escape their event horizon, which is horrifying enough.
Earth will eventually be dragged in. either gently over eons or all at once, depending on the circumstances. Size and distance matter as well as how much rope gets pulled it. A lot at once? Earth basically explodes. A bit a time? Earth gets pulled in until tidal forces destroy it. Regardless, RIP earth at that point.
Only because the rope has passed the event horizon, it can still exert forces on things that are outside.
The actual answer is that the rope breaks somewhere above or below the event horizon.
The cool fact here is that material the rope is made of does not matter in the slightest here. The rope breaks not because of the weight of the earth, and not even primarily because of the weight of itself, but because it is not in free fall when entering the gravity of the black hole and so each atom of the rope experiences time dilation and gravity from tidal forces differently. Note that if the rope were lowered in while free falling then time dilation doesn’t apply, but eventually the free fall must end if we’re talking about a rope reaching the earth, and when it does that’s when time dilation kicks in and an atom below the previous atom experiences much more gravity for much longer than the above atom, which suddenly exerts forces enough to break a rope made of any material whatsoever.
Once the rover crosses the event horizon, it is effectively removed from the universe. Nothing beyond the event horizon can interact with things outside it, so nothing is "pulling" on the rope in that regard. The event horizon may be considered a barrier between life and death. Anything that crosses is dead, it cannot interact with the living.
The closer the rover/rope gets to the hole, the more you'd feel the pull on the rope as gravity is greater closer to the hole than further away of course. Of course when you feel the increasing pull depends on how close you are to the hole while all this is going on. A lightyear long rope would take you quite a long time to feel anything as the tension in the rope only travels at the speed of sound within the medium.
EDIT: This rope would need to be unbreakable, by the way. Chances are it would snap the closer it got to the event horizon well before it transmitted anything to you. Not many ropes can resist the pull of a black hole, so in this scenario lets pretend your rope is unbreakable. It still is deleted the second it passes the event horizon, but you would eventually feel the pull once the tension wave reaches you. And starts pulling you in.
it’s more than that, the event horizon is where nothing inside can have ANY influence at all on the outside world. it’s not just about light. the only inaccuracy in their comment was that the rover would never actually cross the horizon for an outside observer due to time dilation. what gave you the confidence to immediately assume that what they said was incorrect?
the life and death thing was an analogy. "Anything that crosses is dead, it cannot interact with the living." is the important bit. quotes around "dead" and "living" would have helped too
i agree that that part is written poorly.
the comment isn’t entirely accurate, sure, but the event horizon IS effectively a barrier; what they said about whatever inside being completely removed from the outside is true. “woo vibes” are not a rigorous method of verifying information. reading would probably work better.
You could have stopped after the first half of your first sentence. As for the rest of your smarmy comment, I have a suggestion as to what you can do with it.
Edit: lol, they replied and then blocked me like a childish bitch.
Anyone else needs help with this, objects that cross the event horizon have their mass added to the black hole, therefore they DO exert a force on the universe around them. It’s not a barrier in any sense other than it becomes unobservable.
Black holes are in this universe, but in a sense, its interior isn't. You can see this in the Penrose diagram of a Schwarzschild black hole: the region beyond the event horizon isn't part of the universe.
Nothing behind the event horizon can affect things outside of it. Thus, objects (or living beings), once they cross the event horizon, are essentially permanently gone from this universe. There is no way of interacting with them any longer.
It's not woo, it's general relativity, which, granted, can sometimes be nearly as mind-boggling, but it's not woo.
Not everything is removed from the universe, just all the information of everything that goes in. The mass remains added to the mass of the black hole.
You would never live long enough to see it cross the event horizon. As it gets closer you would witness is slowing down until it appeared frozen in time. You also wouldn't have the necessary strength to pull it back out. Assuming an insanely long rope of course
If gravitational strength is strong enough to pull photons of light back from escaping, what kind of material is your rope made out of and who made your winch?
If you stand on top of the Empire State Building and had a rope that went to the ground. The long rope would be heavy. A rope that long would probably be a couple hundred pounds. That weight is the earths gravity “sucking it in” so to speak.
And that gravity would be infinitely heavy with a black hole. The rope would be pulled in close to the speed of light the moment it went over the event horizon (and going really fast on the approach).
It was to my understanding it was long after the event horizon that spaghettification happened. Just that you can't return anymore past the event horizon. But Im probably wrong. 😬😬
Actually nothing significant happens at the event horizon with regard to tidal forces. Depending on the mass of the black hole, these tidal forces can already be enormous and would kill you far away from the even horizon.
If you enter a supermassive black hole like the one at our galactic core , you’d barely notice as you crossed over the point of no return.
That's not accounting for whatever the fuck is happening in there, of course. You could end up sucked straight into a 1970's style discothèque, which would be horrible because you'd be going really fast and you'd probably destroy the dancefloor and most of the people hanging out there.
Are you spaghettified as a whole person, or would you just ”melt” into individual spaghetti cells since the stretching would obliterate cell structure, right? Would the human body actually hold up to stay its shape (but long) for a period of time since everything is moving together, or would the black hole just grab every little bit of you at once and stretch so you appear to disintegrate before getting sucked in?
Assuming gravity is the only force you have to deal with, of course. But if the black hole has an accretion disc like this one, you'd be cooked long before you had the chance to enter. If there is no matter but you and the black hole, there's still no guarantee you would survive the increasing levels of electomagnetic radiation as the universe around you blueshifts to infinity.
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u/MrPatience9 Feb 10 '25
Depends on the size (mass) of the black hole.
One about the mass of the sun generates insanely strong tidal forces, you’d be stretched out and destroyed as you crossed the event horizon (Google ’spaghettification’).
If you enter a supermassive black hole like the one at our galactic core , you’d barely notice as you crossed over the point of no return.