/sci/ - Science & Math

okay, i understand why black holes must have entropy but i don't understand how.

if light can't escape black holes, how can they shoot out jets of radiation?

Imagine if we could control gravity to the point where we'd have public rooms where you could try it. Maybe we need something so strong that could at the same time cancel out Earth's gravity, but not destroy the planet.
Time would be different in those rooms. So people could get in for an hour and sleep, but they'd feel like they've slept 10 hours. Then we'd be able to get on with our lives much faster and we'd solve so many problems.

Am I full of shit or this even possible? I thought it up because Hawking said that we can slow down time for us by orbiting around a black hole, not get sucked in (because of speed and position), and exit later in time.. Maybe if we could replicate that on Earth.

I don't know, am I wrong?

>>4670630
Precisely! I want to see this happen in my time. Not necessarily the entire ark scenario, but more or less see technology advance further in this direction. Probably wont happen though :/

theoretically speaking, is it possible to harvest energy from a black hole? considering you have unlimited technology how could you achieve this and what amount of energy are we talking about?

http://www.bing.com/videos/watch/video/extraterrestrial-communication/pp5pm55?q=Science&rel=msn&
amp;from=en-us_msnhp&form=MSNHRO&gt1=42010&overlaytype=multimediaviewer&name=hpvideo
6&csid=ux-en-us&initialmoduleindex=3

Black holes as inter-universal communications, or silly Polish nonsense?

Hello I am a time traveler from the year 2031.
I can answer most questions you have.

these guys are beasts

What happens when two black holes collide with each other?

Ars has a good summary of emergent entropic gravity.

http://arstechnica.com/science/news/2011/04/is-gravity-a-result-of-thermodynamics.ars

In the event that Higgs Boson is found not to exist in the near future, then there's a good chance that this theory is far more likely.

Sup /sci/.

Is there any scientific consensus on the mechanism behind black holes emitting radiation? Without having studied the phenomenon in-depth, I assume that the information isn't being sent from inside the event horizon, as not even light can escape from inside the event horizon.

Is black hole radiation just bullshit? By that I mean that you can postulate that it's in fact matter in the ergosphere that emits radiation, and not matter from within the event horizon?

Inb4 spontaneous synthetization of two completely opposite particles travelling in completely opposite directions and in opposite directions of time.

Does anyone use Mathematica here? I use Maple, and I'm currently trying to "translate" the Orbits Around Schwarzschild Black Holes (http://demonstrations.wolfram.com/OrbitsAroundSchwarzschildBlackHoles/)) demonstration into Maple syntax. I'm having a few problems though.

First of all, when it defines the domain as r/.anOrbitSolution[[1,1]], what does this actually mean? I know the "r/.anOrbitSolution" part takes out the value of r from anOrbitSolution, but I can't work out what the last part does. Double brackets have something to do with lists, don't they? Likewise in the function 'timeDilation'.

Secondly, What does [end] signify, again like in 'timeDilation'. Is it the last value of t in anOrbitSolution, i.e. t(pT)?

Tl;dr: In Mathematica, what do "[[1,1]]" and "[end]" mean?

Greetings, /sci/. I, for the purposes of bettering myself, do math problems in a book that I bought, one per night, for fun. But tonight, this one got me. I tried it alot, but I got nothin'. I wondered if any of you would like to take a crack at the challenge. Here it is:

"A 6.0x10^2g sample of water at 90*C is mixed with 4.00x10^2g of water at 22.?*C. Assume no heat loss to the surroundings. What is the final temperature of the mixture?"

Could a black hole move through space? Have momentum or velocity?

Okay /sci/, what would happen to water if I put it in a black hole? Remember that water can't be compressed.

N = kg*m/s^2 => N = kg/s * m/s
kg/s = dm/dt
m/s = v

So F = v*dm/dt
Therefore Force is a scaled rate of change of mass.

Everything you thought you knew about physics is wrong.

If you can't see a black hole then why is it called a black hole instead of "an invisible hole"?

It's said that a black hole has no volume. How can it have any mass if it takes up literally no space? And would the black holes 'age' if it didn't take up any space? Why would it expel energy at it's poles if anything past a certain point can never return?

give me an interesting theory to read

Somebody explain blackholes to me. Not just how their created, but what they do, the science behind it, the details, and I wanna hear your theories on whats ON THE OTHER SIDE?! O_O

Hey /sci/entists, what happens when two black holes meet? Do they create a super-black hole, or do they both get neutralised?

While we have our current knowledge of them.

Will black holes and whats inside them remain eternally never fully understood to science?

how big is a black hole? what's the biggest it can get before it collapses onto itself? if black holes vaporize do they at some point stop being black holes? what is the matter inside black holes like? is the gravity strong enough to rip atoms apart?

I have a question about black holes

If Supermassive Black Holes are the center of a galaxy, why does any picture of a galaxy or picture of black holes in general, always lit up? Why is there never just a black spot in the center of a galaxy rather than the entire galaxy veiled in light.