Nuclear Engineer Reacts to Kurzgesagt 'What Happens if You Destroy a Black Hole?'

Original Video @kurzgesagt @fZPc

Nuclear Engineer Reacts to Kurzgesagt "What Happens if You Destroy a Black Hole?"

[vettir]

The spin limit works because a spinning black hole causes frame drag around it, resulting in, essentially, anything aimed to add spin in the same direction simply being flung out because the frame dragging speeds it up.

[WhyneedanAlias]

Fun fact, the idea that there cannot be naked singularities is actually called the cosmic censorship hypothesis.
Also I find spinning black holes really interesting, at least if you follow general relativity (which we cannot be sure holds beneath the horizon) there should actually be an inner event horizon in addition to the regular one where sub-lightspeed travel becomes possible again and time and space flip back to their ordinary roles. You would be able to move around freely in there around the singularity but never be able to leave. With additional charge/rotation the inner one grows and the outer one shrinks until the'd meet and disappear.
PBS Spacetime has great videos on topics like that

[Jan_Koopman]

"I wanna cuddle a black hole!"
Famous last words

[retronicotine]

This has gotta be one of my favorite videos of yours, added a ton of additional information and made it more then just a reaction, keep it up man. loving the channel so far

[jiggyjustin]

Your explanations are so clear and easy to grasp, love the additional info and content

[Rathmun]

9:09 "How's the limit of spin work?" The search term you want is "Frame Dragging" When a massive object is spinning, it actually drags Space-Time in the vicinity with it, spinning the very fabric of reality. If the local space-time is twisted _enough, _ you might reach a point where there is no trajectory from the outside of the black hole to the inside. The phase space of possible trajectories has a hole in it.

[ascohn]

Tyler's empathic "aw" expression when the black hole has a sad face is literally the cutest thing on the internet right now.

[LamirLakantry]

The reason why overfeeding spin is difficult, (in my laiman understanding) is because it makes the ergosphere stronger. That is the region of space around the black hole where space-time is being dragged around faster than light. Even in current black holes, the rotation stops objects from falling in, and it's only thought a friction prosess in the ecrecion disk that forces any matter past the horizon.

[VECTR]

I watched that video yesterday. It was just as enjoyable as the first time. Great reaction!

[MrDevintcoleman]

As a layman who became fascinated with space and theoretical physics in 7th grade when I asked my school librarian where I’d look for books on black holes and she said “they’re called dark holes and they’re not real, ” I’m incredibly proud of the fact that every thought I had about this Kurz video when I watched it was also something Folse brought up!

[particlephysics_lee]

I'll explain the "Spin limit"
The formula for the event horizon of a spinning black hole is very long and complicated, however, if you simplify the formula
(Let's say G = c = 1), and the observing angle is 90deg downwards, the event horizon of the Kerr black hole will look like this

r = M + sqrt(M^2 - a^2)

r = Event horizon radius
M = black hole mass
a = the spin of the black hole (J/M)

As you can see, because (M^2 -a^2) is square rooted, a^2 needs to be smaller or equal to M^2, or a <= M
If a = M, it also means that a/M = 1. This is the "Spin" limit, the spin needs to be equal or lower to it's mass

If a > M, therefore (M^2 - a^2) < 0, if you square root a negative number, you get an imaginary number, thus it's not real

So if a black hole has it's spin (J/M) that is larger than it's mass, the black hole event horizon formula will have an imaginary number, thus, IT CAN NOT EXIST therefore a naked singularity is formed

[andregon]

There's another method.
The insane method: Use negative mass.
Negative mass has anti gravity, is attracted to mass, repels mass, and moves to the opposite direction of the force being applied to it.

As far as I know, negative mass are the weirdest particles known in the universe.

Do you want to break physics while breaking physics? Use negative mass.
It will make dividing by 0 make sense by comparison.

[fewrwaawrwqa]

I knew you were gonna make a reaction video on this! Great job, you made this video so quickly!

[rams]

i like how you've gotten a little louder in ur intros lol, sometimes in the past I could barely hear you until you started reacting... keep it up!

[troublesometoaster]

I love how Tyler tells you when he doesn't know something rather than making up Folse information.












(sorry, I had to)

[demigreen]

I need more of these react videos!!! Hearing a real scientist’s insights is so fascinating! Thank you for this it was very entertaining and I subscribed!

[samuels]

I wonder, if you have a high enough mass black hole, can you spin the singularity enough to create an empty orbit? a ring of infinite density, forming a sort of torus which probably can never have a hole for the force necessary to stabilize it.
Also, I suspect there is a possibility that black holes could simply un-implode under such extreme forces, with the singularity's effects being undone a massive mess happens with spacetime, but it would then just release the mass as energy now that gravity can't hold it together.

[fuseblower]

I still want that anti-matter moon though. Not to fling at a black hole but just to show off to aliens

[marionetteking]

I imagine it's like a merry-go-round at a playground. The faster the spin, the more difficult it is to get on and stay on

[steventreadway]

America’s most produced nuclear warheads have variable yield settings. The same warhead can be set from 25 kiloton to 20 megaton depending on settings. Lots of things have to happen at fraction of a second to increase or decrease the power of detonation. Don’t take my word for it, there’s a wealth of info on the subject right here on YouTube.