# What would happen if two black holes (of equal mass and density) traveling at...

SniperGod

what would happen if two black holes (of equal mass and density) traveling at light speed collided? would it be an elastic or inelastic collision?

BlogWobbles

@SniperGod
what would hapen if something impossible happened?
Get the fuck out

RumChicken

@BlogWobbles
look man if you don't know the answer just say so

ZeroReborn

@SniperGod
Don't black hole's basically always collide at light speed due to extreme gravity.

BinaryMan

@SniperGod
traveling at light speed

https://en.m.wikipedia.org/wiki/Special_relativity

PurpleCharger

@BinaryMan
thank you for contributing absolutely nothing to this discussion

@ZeroReborn
I'm not talking about their gravitational force, I'm talking about their velocity.

Ignoramus

@PurpleCharger
He’s saying you can’t travel at the speed of light

whereismyname

@Ignoramus
the question is hypothetical. if it makes you feel any better I'll change it to "near light speed" instead.

Boy_vs_Girl

@PurpleCharger
If you're not aware of widely established common knowledge for 100+ years theres no discussion .

Soft_member

@whereismyname
You cant hypothetically travel at the speed of light

SomethingNew

@Boy_vs_Girl
it contradicts itself because it's hypothetical.
@Soft_member
do you know what hypothetical means?

StrangeWizard

@SomethingNew
Hypothetical

Definition:

Adj.) Denoting or containing a proposition of the logical form if p then q.

Need_TLC

@StrangeWizard
So explain to me how this contradicts what I said.

cum2soon

@Need_TLC
what would happen if two black holes (of equal mass and density) traveling at light speed collided? would it be an elastic or inelastic collision?

Please locate the “if... then ...” statement

@SniperGod
Travelling at light speed they would release infinite energy

AwesomeTucker

@cum2soon
It is an if then statement, just rearranged. If not, then it's not hypothetical as you claimed. Either way, it's a shitpost.

StrangeWizard

@cum2soon
if two black holes (of equal mass and density) traveling at light speed collided?
what would happen IF two black holes (of equal mass and density) were traveling at the speed of light and THEN collided?
relying on semantics to win an argument
not just answering the original question because you're an asshole

Ignoramus

@AwesomeTucker
it's not a shitpost I'm genuinely curious

@SniperGod
Traveling near light speed they would still merge and end up with zero velocity (assuming you are talking about a head on collision). There would probably be a fuck huge energy release in gravitation energy (gravity waves).

You'd do well to stop arguing with people that just want to argue for the hell of it.

TalkBomber

@StrangeWizard
You’re still not understanding what a hypothesis is, and what an “If, then” statement is.

IF some initial thing is observed, THEN some secondary state will be observed.

IF I touch my bare hand to a hot stove, THEN I will be burned.

relying on semantics to win an argument

There’s no argument to win, because you have no hypothesis. You’re trying to find an answer to a thought experiment.

Besides that, semantics are extremely important in science generally, but especially when attempting to show something through logic.

RavySnake

not just answering the original question because you're an asshole

@SniperGod
what would happen if two black holes (of equal mass and density) traveling at light speed collided? would it be an elastic or inelastic collision?

1a - an object, as per my understanding, cannot travel at the speed of light, as described by special relativity.

1b- we have amended this to “traveling near the speed of light”. All object traveling that close to the speed of light would have an insane amount of energy.

2a- Two black holes of equal density: as far as I know, there isn’t actually a way to determine the density of a black hole

2b- we have amended this to” two black holes with the same mass”

3a- what would happen if they collided: there are many different types of collision, such as glancing blows, or arriving from different axises.

3b- we have amended this to “had a ‘head-on’ collision” which leaves something to be desired, but is closer to the point.

4a- there are some other issues, but we’ll do out best to ignore them

4b- “what would happen if two black holes, with the same mass, were traveling near the speed of light, when they collided head on?”

I would surmise, based on the available evidence, that having so much energy, they would act more like supermassive black holes because of extreme amount of energy they contain, and would similarly bounce off each other, producing lots of nice radiation, rather than merging, like smaller black holes do.

But who knows?

TechHater

@Need_TLC
you talked of black holes traveling at c , black holes have rest mass.

BunnyJinx

no they wouldn't ,if they set their speeds arbitrarily close to the speed of light you can get arbitrarily large amounts of energy but saying they're 'traveling at the speed of light' is a self contradiction since you're implying their speed is lorentz invariant and they have no rest frame .but having no rest frame contradicts the definition of matter .

StrangeWizard

@StrangeWizard
the sentance
black holes were traveling at the speed of light
is in of itself a self contradiction regardless of everything else you said .

Nojokur

@StrangeWizard
sentance

Dreamworx

@RavySnake
Thank you.

Lord_Tryzalot

@TalkBomber
A hypothesis requires an "if, then" statement, a hypothetical thought experiment does not.

Boy_vs_Girl

@Lord_Tryzalot
Fair enough, but all thought experiments are hypothetical under that use of the word.

Who got the Einstein Spectral Code on hand? lets do a simulation?

w8t4u

Duh, they become tachyon black holes and move backwards in time until they stop existing as the time zero.

Poker_Star

@Boy_vs_Girl
I mean they are. A hypothesis is a special type of hypothetical thought experiment that adds the restriction of a prediction, the "then" part of an "if , then" statement.

FastChef

@StrangeWizard
consider suicide, brainlet.

Meh, another worthless thread by a retard...

Lord_Tryzalot

@StrangeWizard
relying on semantics to win an argument
not just answering the original question because you're an asshole
This is how Veeky Forums works you mong, if you wanted an answer, should have gone to stack exchange.

farquit

@w8t4u
The joke in the pic doesn't work, because it implies the "brainlet" has so much brain mass it has formed a black hole.

Bidwell

@RumChicken
@whereismyname
@SomethingNew
@Need_TLC
You sir are an idiot. Or ignorant, oblivious about your own ignorance and wanting to hit everyone trying to drag you out of the mud.

Might want to ask how much is 1+2 assuming that 1=2, and save everyone the trouble. Also, with our definition of mass, black hole, and speed of light, you cannot have objects with mass traveling at the speed of light. So the answer doesn't exist, or you can invent it and it would be just as valid.

likme

@Bidwell
how much is 1+2 assuming that 1=2
Somewhere between 2 and 4. Like three fiddy, I'd say.

TreeEater

@RavySnake
there isn’t actually a way to determine the density of a black hole
Literally divide by zero.

TurtleCat

@Bidwell
1+2 assuming that 1=2

So, 4?

You sir

recommend suicide

5mileys

@TurtleCat
1 = 2
2 = (1 + 1)
2 = ((2+2) + (2+2))
1 + 2 = 2 + ((2+2) + (2+2))
2 + ((2+2) + (2+2)) = 10
1 + 2 = 10

Evilember

@Bidwell
They corrected their initial statement by saying near-light speeds instead of light speed. Who's the idiot now?

RavySnake

@Lord_Tryzalot
Veeky Forums BTFO

TurtleCat

@SniperGod
It would be extremely painful

CouchChiller

@SniperGod
I'd like to see that happen

tfw it's impossible to see a black hole

@CouchChiller
you can see the distortion around a black hole

Nojokur

@RavySnake
as far as I know, there isn’t actually a way to determine the density of a black hole
you can calculate mass by the gravitational pull, and you can use the event horizon radius to determine its volume

Garbage Can Lid

@Nojokur
The event horizon isn't the surface a black hole. It's the point beyond which nothing can escape its gravitational pull. Most of the mass of a black hole is in its singularity, which is theoretically microscopic.

5mileys

@Garbage Can Lid

Using anything else would get you different measurements based on the locations of the observer.

cum2soon

@SniperGod
2 black balls colliding

takes2long

guess what causes acceleration?

@takes2long
changes in velocity over time?

@Garbage Can Lid
he didn't say it was. He just said that you can use the event horizon to calculate the volume.

Stark_Naked

But not the density, which was the point. The mass is concentrated at the singularity. If nothing is being drawn in, there might be 0 mass at that point.

Lord_Tryzalot

@Stark_Naked
The original point was to show how you can determine density of a black hole. Most black holes are near other objects, and we can tell the mass of the black hole by knowing the velocities of the objects around it.

whereismyname

What would happen if a sun of lava and sun of ice both equal in density and mass were to collide?

Fried_Sushi

@Lord_Tryzalot
Mass isn't density. Mass per volume is density. You can't calculate the density of a black hole because all of the mass is in (effectively) zero volume at the singularity. That's one of the reasons that they say "the laws of physics break down at a singularity." The math stops working there.

Bidwell

It would would both collide inelastically and elastically. Hypothetically of course. Also it wouldnt collide.

Poker_Star

If it moves at the speed of light then it would have infinite inertia.

The collision would generate infinite elastic and inelastic forces and also distort space to conform to the infinite inertia. As such it wouldnt collide and collide simultaneously by splitting its velocity to two different paths in space. One where the forces conserve and cancel monenta and where their momenta phase through. In either case the black holes wouldnt even exist in 3d space because theyd lorentz transform into dimensionless points. But again they are already dimensionless singularities. So it leads to the same system.

Methshot

@Poker_Star
To conclude this, basically nothing would happen. The black holes would just appear as if they arent even moving.

Sharpcharm

@SniperGod
They would probably go through each other.

Neither has the mass to keep the other inside their relative horizon, so they would just phase through each other.

Snarelure

@Sharpcharm
Except anything in the horison has to move faster than light. Thats the relation. Regardless of mass.

Spamalot

@cum2soon
rekt

Spamalot

@5mileys
2 isnt 1 +1 if 1=2 you dumb shit

farquit

@Spamalot
1+1 = 2 regardless if 1=2 or not

takes2long

@SniperGod
wouldn't they just do the exact same thing as a fucking ball in space hitting another ball in space
they have equal mass and density
am I missing something or is this a boring question

idontknow

@farquit
are you dumb?

I would think that, since nothing can escape the event horizon, even another black hole, their collision would be completely inelastic because they have no way to "bounce off" each other. I don't know how any energy would be released either, so maybe the resultant black hole would end up with a larger mass than the sum of the two original black holes.

Dreamworx

@SniperGod
I'm no psyishian but looking at your pic they make like a dog nose nostrils looking thing??

Techpill

@SniperGod
being in a vacuum the only thing capable of giving velocity is gravitis "acceleration". at event horizon the gravity pulls faster than light. if you mean the moment they hit each other they have the speed of light then it always happens (in fantasy land) when they collide as they just suck each other into incomprehensible shit. object that have mass can never be accelerated to the speed of light as we understand physics.

Ignoramus

@SniperGod
I predict that it will be an elastic collision in accordance to classical physics. But regarding the singularity, quantum physics should also be concerned with this.
Black holes are themselves very mysterious objects, we haven't studied them properly yet so such hypothetical questions cannot be answered properly.

Supergrass

@cum2soon
Fuck off

Dreamworx

He's asking what causes it, not how it is caused. Gravitational force itself is responsible for the velocity.

Stark_Naked

@whereismyname

Raving_Cute

@Fried_Sushi
You can't calculate the density of a black hole because all of the mass is in (effectively) zero volume at the singularity.
A black hole's volume extends from the centre also known as the singularity to the event horizon, so your aforementioned statement is wrong.

Flameblow

@SniperGod
"Oops, sorry."
"Pardon me."

Emberburn

@SniperGod
inelastic because the matter is compressed to the point there is no space and the energy inside the event horizon at collision wouldn't escape.
Butt, that's straight from my ass.

SniperGod

@ZeroReborn
They orbit at near light before colliding I guess.

ZeroReborn

@farquit
The black hole isn't touching the brainlet, his brain is low mass because most of it has already been sucked in.