After watching this movie for the third time

And now that i'm at it, i shall add that time indeed changes inside a black hole, so i'm guessing that's where the writers got their idea to "modify the past".
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Sadly, time changes inside them because time is relative to the speed of the observant, and since you speed raises up to infinity while getting pulled, time simply "stops" inside the black hole.
But you can't go back in time. I'm sorry.

Different question then, do you watch doctor who?

Hell yes i do.
Not the old one though, just the new. I don't have time to look up those old chapters.

Same!! Then I'll only say "nothing is impossible, just highly unlikely!" But I actually do appreciate the paragraphs :)

No problem :p.
And yeah, maybe going back in time is possible. Just not with classical physics. I've seen some studies about it with quantum pyhisics but.. definetly not an astronaut AND a robot going back in time to the 5th dimension or whatever :p

Yeah, it's just all so interesting. I love studying and thinking about things we don't know much about/anything about cause really anything might be it.. I want to be a theoretical physicist.

I thought you wanted to be a musician?
@darkan
IIRC, the black hole image in Interstellar is extremely accurate, enough so that scientists are using it as the computer model.
Back on topic (because that was rather off topic)...
You can't use classic physics in such an extreme situation. There's such a difference in relativity that locally (and under that much gravity it'll be a very small volume of space) you can use classic Newtonian physics but all you can really use are quantum theories.

For example, F=mA will always hold true no matter where you are (in our quadrant of the universe). But what F and m and A are defined as in different regions are completely different because of relativity.
At least...I think that's how it works.

Hey, I do want to be a musician too :D but yeah that's what I was trying to say but you have said it very well so thank you

@tyler
Classical physics apply on the entire universe, on whatever conditions there may be. The only and unique exception are quantum physics, which ONLY applies to particles and atoms. Black holes are, as i said, just a really impressive demonstration of the gravity's power, but nothing classical physics cannot explain.
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F is always the definition of force, which is as you said, mass times acceleration.
The definition of mass and acceleration never changes, and therefore F does not as well.
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(to be continued, hold on)

Let me explain (reaaally simplified) what relativity is:
A. Einstein discovered the Relativity Equation, which is:
E = mc² || Where E means "Energy", m means "mass" and c is a constant: the speed of light (in a vacuum enviroment).
Relativity is based on this equation alone, combining it with others we already knew. Focusing on the time matter that we are discussing here: One of those combinations creates an effect called "time dilatation".
That effect basically means that time is relative to velocity: The faster something moves, the slower time goes for it.
Being the speed of light the fastest velocity physically possible for any partice with mass, when you approach it, time goes slower and slower to the point it just doesn't continue when you reach that 100% speed.
That's why I said "time simply stops inside a black hole".
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But of course, anything with mass crushes and desintegrates before that speed is reached, because nothing can handle that much energy (infinite energy)

Also, relativity is very complex, what we are talking here (just time dilatation) is the "easy" part of it.

I shouldn't have said "definition". I meant more like "what it encompasses". Doesn't mass change with velocity? E=mc^2? Your mass changes differentially across the gravity field because parts of your body move faster than others in that extreme of an environment; spagettification.

But of course, anything with mass crushes and desintegrates before that speed is reached, because nothing can handle that much energy (infinite energy)
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And what do you mean by this statement? You can't have infinite energy. You can have infinite density, is this what you mean?
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Slightly related fun fact, you can create a black hole with an enormous amount of energy and no mass. The density of energy creates an event horizon. This phenomenon (in theoretical physics) is called a kugleblitz.

mass is unvariant and inherent of any particle. It does not change with speed. What changes is the force you gain, with the acceleration (F=ma). Acceleration changes, mass does not.
And what matters in the equation is mass, not the force from it times acceleration.
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And that's exactly what i meant: You can't have infinite energy, nor an object can hold it. That's why, as you aproximate to that limit of inifinte (limit of infinite, not infinite), everything ends up disintegrating. Which is what happens inside a black hole.
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I'm actually not sure what would kill you first: The gravitational pull of the black hole, or the energy you accumulate at those speeds. Probably the gravity for a human. We can't even handle 10x the gravity of the earth without blacking out or dying :/.
And you MAY have infinite density, if we consider singularity to be possible. But aside from that, nope.

Also, where did you get the "black hole with no mass and enourmous energy" thing? It doesn't follow the Relativity Equation:
E = mc².
If m = 0, then E = 0.

Radiation. If you fill a space with an immense amount of radiation, it will form an event horizon.
http://en.wikipedia.org/wiki/Kugelblitz_%28astrophysics%29
The relativity equation also says that mass increases with speed (or maybe it was decrease...I forget but I know it changes). If you're moving, you have kinetic energy. E/c^2=m. The energy adds a negligible amount of mass (but adds mass nonetheless).

There are two types of mass: Absolute mass (not sure if that's the term in english) and relative mass.
Absolute mass never, ever changes, by definition.
Relative mass, on the contrary does change, increasing with the velocity, although it's not directly derived from the Relativity Equation. (Relative) Mass is just a measurement for the acceleration of an object (or force.. Gah, something like that. Gotta look that up later). As far as i remember, the equation was:
M = (lambda)*velocity*mass.
Where M is the relative mass.
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As for the radiation: Radiation is just a constant pulse of particles. Particles have mass, so the black hole still has mass.
What i'm guessing you tried to say is that the black hole forms because of the energy, and not the mass of the object (which it still has). That seems to be true in theory, but i don't know why would it form, aside from (and this is a wild guess i'm doing) that energy can transform into mass, and viceversa.

radiation behaves as a wave and particle. As a particle it has no mass.
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Yes energy and mass can change with each other.

I've learned more in this comment chain than a semester of physics at a public high school

but its useless knowledge unless you go into astrophysics; this ain't your everyday classic Newtonian stuff.

But I want to..

indeed? I wish you luck. Remember me when you discover and name a new planet?

Haha I will! And thanks!

It's only photons the ones who don't have mass, hence why they can travel at the speed of light.
Any other particle has mass: http://en.wikipedia.org/wiki/Radiation

radiation is photons?

I should clarify. Radiation is a generic term for anything emitted. Electromagnetic radiation, photons, can create a kugel blitz when in sufficient intensity.

True, I didn't count the waves in there.
I lost the track of what are we debating about tbh xD.

as did I.
Have a snowman.
⛄️

All i see it's a unicode error. Close enough? lol :p

I love you both

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