What are Black Holes - a simplified overview

[fallenzeraphine]

http://upload.wikimedia.org/wikipedia/commons/thumb/c/cd/Black_Hole_Milkyway.jpg/750px-Black_Hole_Milkyway.jpg

I'm sure most of you might have heard the word "Black Hole" some time in your life, either from a documentary or a Sci-fi TV series etc. i thought of writing this overview for those people that are fascinated about Black Holes but don't really understand what they are, but first before getting in to a black hole there are some basic things that you have to be familiar with lol.

1. What is Gravity? - Gravity is a very weak force that accompanies any thing that have a Mass, everything that has a mass are attracted to each other because of gravity, gravity gives us weight by pulling us constantly towards the earth, remember gravity is one of the weakest forces in the universe, take earth for example it is quite huge, and has quite a bit of mass but still we can walk and jump around on it.

2. what is Escape Velocity? - Escape Velocity is the minimum speed that is needed to escape from a gravitational field. for example if you throw a rock in the air no matter how hard you throw, it just fall back on to earth, but if you are somehow able to throw the rock at the escape velocity of the earth it will break free from earths gravity and venture in to outer space.

3. Speed of light? - Speed of light is according to General Theory of relativity is the absolute maximum speed attainable. in simple terms nothing can go faster than the speed of light, it equals to 300,000 Kmps

4. What is a Black Hole? - Black Hole is a point in space that have a Gravitational feild so massive, nothing can escape a black hole not even light, so we call it a Black Hole....

Ok well thats a very draft Answer to that question, now lets get in to more details shall we

Formation of a Black Hole

Black Holes are formed in two ways as far as we know and this is the most common one

Gravitational Colapse of a Star -

Take our good old sun, you know that its extremely large, hence it has a massive gravitational feild enough to sustain 8 planets and billions of smaller debree and some minor planets, and you know that sun is a star, Stars dont have a solid surface of sorts, they are just massive balls of gas held togeather by their own massive gravitational feild, stars reach gravitational colapse when it no longer has enough fuel to keep it from shrinking because of its own Gravity, when a star cools down, all the matter in the star starts moving toward the center of it and the star starts to shrink, in the case of our sun this shrinking will stop at certain point and will produce a dwarf star, because suns mass is not enough to produce a black hole, say we are talking about a star 20 times the size of our sun, the gravity of this star would be so massive, when it colaps all the matter in it will shrink in to a point in space called a singularity and will form a black hole. but remember that the overal gravity of the black hole is still equal to the Gravity of the colapsed star, but since now all the matter is in the state of singularity, gravity is oncentrated in a much smaller space. all Black holes have a hypothetical distance from the center of the singularity where the gravity will cause escape velosites exeeding the speed of light, this hypothetical barrier is called the Event Horizon, anything that falls in to the Event Horizon will get stuck there with no hope of escaping, even light. Beyond event horizon our laws of physics seize to exisist.

Some cool things that can happen arround a black hole

In General Theory of relativity Time is affected by gravity, and this is scientificaly proven, Time usualy bends near objects with a lots of mass, and also it relatively slows down, say if ur a observer in a earth orbit where earths gravity is much less, in your point of veiw a clock on the surface of the earth runs slower than the clock on your wrist, but this amount is extremely small, we can never detet the difference. But its different in the case of black holes, say ur some distance away from e event horizen of a black hole and you send a ship towards the event horizon in your point of veiw you will notice that the ship slows down as it gets near and near to the black hole and finally you will see the ship stop to a halt as it enters Event horizon, in your perspective the ship will stay in a complete stop forever near the Event Horizon, but if you were on the ship you will be having a very painfull journy towards the singularity lol. this effect is called the Time dialation. so you can stop time near a black hole isnt that cool lolz

Space is also effected by gravity, and space can bend near a object with a extremely large Gravitational field, and thus creating a worm hole, a worm hole connect two dsitant spots in space time, acting as sort of a bridge, remember they are strictly hypothetical and not scientifically observed, it is belived that even if worm holes exist they will not be traversable, because of their fragile nature and the amount of radiation, time dialation involved, but its cool to know such thing can Theoritically happen. this image shows how a worm hole connects two points in space time.

http://upload.wikimedia.org/wikipedia/commons/a/af/Worm3.jpg

I hope this gave you some idea of what a black hole is, just browse arround the net and you will find tons of information regarding all the stuff that are discussed here.

[indika_sam]

wow, it is really interesting,

i read about this black hole many years ago. but those days it was a wonder, how could it happened. as i think it was on 2001 or 2010 novel.

anyway thanx for sharing with us.

keep it up bro.

[fallenzeraphine]

wow, it is really interesting,

i read about this black hole many years ago. but those days it was a wonder, how could it happened. as i think it was on 2001 or 2010 novel.

anyway thanx for sharing with us.

keep it up bro.

you are welcome, if u can find there's a book by Stephen Hawkins called "A Brief History of Time" Read it

if u have any questions pls ask

[racool]

Thnx for sharin the info..

by usin a black hole can somethi go from one place to another place in a short time?

[fallenzeraphine]

Thnx for sharin the info..

by usin a black hole can somethi go from one place to another place in a short time?

U can not enter a black hole and return back, every form of matter and energy that goes in to a black hole falls in to a singularity, but because of the Bending of Space time near a black hole one might expect a worm hole to be formed, which connects two points in space time, but it is way out of our knowledge and technology to traverse through a wormhole if they even exists. and im not sure we will ever be able to create artificial worm holes like those depicted in TV series Star Gate

[nuwa1]

fallenzeraphine

Thanx mate, really nice article. in my school days i was really interesting abt space.
acctually this solved some of questions abt Black Holes.
Thanx again machan keep up the good work

[fallenzeraphine]

fallenzeraphine

Thanx mate, really nice article. in my school days i was really interesting abt space.
acctually this solved some of questions abt Black Holes.
Thanx again machan keep up the good work

ur welcome, although this is a very simple article, i omitted most of stuff to make it look simple, but u can read more about this matter on Wikipedia or on research papers

[dil]

this is very interesting...i've heard a lot of things
about black holes.. but this gave me a clear idea about them..

thnx for sharing :yes: :yes: :yes:

[niroshan84515]

thx 4 d info

[fallenzeraphine]

finally with out Hardware stuff
u cant imagine how many things i study with ma spare time mate lool

[fallenzeraphine]

this is very interesting...i've heard a lot of things
about black holes.. but this gave me a clear idea about them..

thnx for sharing :yes: :yes: :yes:

ur welcome

[Nic]

hm ya i was interest about that tng 4m my little age... i love to read about them lot hehe and the wish i have in litttle age was if i going through a 1 some day........... :D

[henderson]

Thnx for sharin the info..

by usin a black hole can somethi go from one place to another place in a short time?

itsa not a black hole, but a wormhole can be used to time travel. Which is shown in popular TV series stargate, those gates creates a wormhole b/w them and allows people to travel extremely faster b/w those gates.

[fallenzeraphine]

itsa not a black hole, but a wormhole can be used to time travel. Which is shown in popular TV series stargate, those gates creates a wormhole b/w them and allows people to travel extremely faster b/w those gates.

actually the thing is this, if u can traverse through a worm hole (which i doubt very much) it wont allow you to travel extremely fast, it will just allow you to take a short cut to a otherwise distant place.

[tristonz]

Thanx Bro...
Thats sum food for thought..
:yes::yes::yes:

[gayannr]

Some serious info,explained as smoothly as Butter,
Thumbs up d00d!

[nrjayasinghe]

Thanks Machan... Mara watinawa...

[nj542]

U can not enter a black hole and return back, every form of matter and energy that goes in to a black hole falls in to a singularity, but because of the Bending of Space time near a black hole one might expect a worm hole to be formed, which connects two points in space time, but it is way out of our knowledge and technology to traverse through a wormhole if they even exists. and im not sure we will ever be able to create artificial worm holes like those depicted in TV series Star Gate

But according to the the worm hole theory isn't that posible worm hole created by back hole is connected to a another black hole in some where in space time?

then even you enter in t a black hole, you'll never get out from the other side 'coz, other side, you emerge right inside a another black hole......isn't it??

[nj542]

actually the thing is this, if u can traverse through a worm hole (which i doubt very much) it wont allow you to travel extremely fast, it will just allow you to take a short cut to a otherwise distant place.

:yes: :yes: :yes: :yes: :yes: :yes: :yes: :yes: .............

max velocity you reach is speed of light.............
but for a person observing from the normal space time............
you r traveling much faster than the speed of light..........'coz' you are actually traveling through space.........not time...........:cool: :cool:

[fallenzeraphine]

:yes: :yes: :yes: :yes: :yes: :yes: :yes: :yes: .............

max velocity you reach is speed of light.............
but for a person observing from the normal space time............
you r traveling much faster than the speed of light..........'coz' you are actually traveling through space.........not time...........:cool: :cool:

haha no mate ur missing the point here, see u cant travel faster than light speed of light is not Relativistic, no matter from where you observe speed of light will be exactly the same, and a observer in our space time wont be able to see a person traveling through a worm hole, cuz the worm hole is created through a extra dimension, for example if u send a ray of light through the worm hole and another ray of light out side the worm hole, the light traveling through the worm hole will reach the destination first not because it traveling faster than light but its taking a shorter path read this form more info

http://en.wikipedia.org/wiki/Worm_hole#Wormholes_and_faster-than-light_travel

[henderson]

I heard that almost all galaxies have a massive blackhole in the center of them. Is it correct?

[fallenzeraphine]

I heard that almost all galaxies have a massive blackhole in the center of them. Is it correct?

yes according to a team of scientists called the NUCKER group made observations on large number of galaxies and found out almost all of them have a Super Massive Black Hole in the center, Scientists now believe that when the Big Bang occurred the scattered clusters of gas gave birth to super massive black holes inside each gas cluster by Gravitational colapse, when these Super Massive black holes are created, they instantlly started sucking up near by gas clouds thus creating quasars (quasars made intense heat differences throughout the gas cluster ) that helped the gas cluster to become a galaxy in time. after some times the energy jets of the quasar makes the super massive balck hole isolate thus completing the forming of the galaxy, our own Milkyway have a super massive balchole in the center, some 25000 light years away from the solar system, but our galaxy is not active anymore casue the Black holes is not swallowing up matter.

[earthling]

you are welcome, if u can find there's a book by Stephen Hawkins called "A Brief History of Time" Read it

if u have any questions pls ask

This is a dumb question..bt what the hell

according to your fun example..if a ship goes near the event horizon of a black hole it stops because the time stops..that means the ship is frozen in time for ever infront of the BH...

then no object can be sucked inside a black hole right ? because u cant get inside a black hole as time stops before that ? :eek:

[fallenzeraphine]

This is a dumb question..bt what the hell

according to your fun example..if a ship goes near the event horizon of a black hole it stops because the time stops..that means the ship is frozen in time for ever in front of the BH...

then no object can be sucked inside a black hole right ? because u cant get inside a black hole as time stops before that ? :eek:

NO that's not true, when a ship enters a even horizon the final rays of light reflected from the ship will get stuck near the event horizon because of time dilation, but the ship it self will be inside the event horizon, remember time dilation is Relative, ppl aboard the ship will not feel the time dilation effect, what we can see is the last rays of light stuck near the even horizon.

[earthling]

so in front of the singularity..time only stops for light but not 4 matter ? really confused now.. :baffled:

[Kalindugayan]

nice post macho

[fallenzeraphine]

so in front of the singularity..time only stops for light but not 4 matter ? really confused now.. :baffled:

lool no no sorry if i made u confused, its just that extremely near the event horizon the escape velocity approaches near light speed and at the place it reaches light speed the light just stops entering the event horizon or leaving it

[henderson]

lool no no sorry if i made u confused, its just that extremely near the event horizon the escape velocity approaches near light speed and at the place it reaches light speed the light just stops entering the event horizon or leaving it

I am bit confused :baffled:, if light can't enter into the event horizon, how can any matter could enter into a black hole? I thought it is not possible to light or any matter to escape from a black hole once they pass the event horizon. And of course I thought it is possible matter or light to enter into a black hole:baffled:.

[fallenzeraphine]

I am bit confused :baffled:, if light can't enter into the event horizon, how can any matter could enter into a black hole? I thought it is not possible to light or any matter to escape from a black hole once they pass the event horizon. And of course I thought it is possible matter or light to enter into a black hole:baffled:.

lool, actually they enter the event horizon what the observer sees is only relative, u can call it a illusion played by time dilation effects

[kosandpol]

ok, thats clear as mud..

BTW, does black holes ever get filled up ?

[GTRZ]

Nice post and super interesting subject to talk.

And if you need science fiction around black holes
read Bobo's Star by Glenn Chandler

Star trek, Stargate series has lot of literature around black holes.

Check this too..

If I hadn't been a player, I
would have become an
astronomer. Why?
Supermassive Black Holes.

-Hugh Heff (Playboy Mansion)

[GTRZ]

ok, thats clear as mud..

BTW, does black holes ever get filled up ?
Blackholes don't fill up. They grow from the mass they feeds on.

[kosandpol]

Star trek is mostly fantasy. Asimov has some good Sci Fi, some of which deals with black holes.
Ofcause so does A.C.C. but I cant recall any of his books dealing with black holes.

[earthling]

Star trek is mostly fantasy. Asimov has some good Sci Fi, some of which deals with black holes.
Ofcause so does A.C.C. but I cant recall any of his books dealing with black holes.

u r right.. I too cant think of any books or even short stories of clerk which relates to black holes..

[ereshthush]

thx 4 d info :yes:

[fallenzeraphine]

ok, thats clear as mud..

BTW, does black holes ever get filled up ?

As GTRZ suggested black holes don't get filled up, rather the event horizon of the black hole gets larger because of the increased mass (hence increased space time warp or gravity) actual singularity remains a singularity ( singularity doesn't have a size of sorts and known laws of physics breaks down in a singularity) and it doesn't change size cause it doesnt have one.

[nj542]

If I hadn't been a player, I
would have become an
astronomer. Why?
Supermassive Black Holes.

-Hugh Heff (Playboy Mansion)

:lol: :lol: :lol: :lol:

Hugh Heff has much more interesting job than a astronomer:lol: :lol: :lol: :lol: :lol:

[Nash_Node]

Nice post and super interesting subject to talk.

And if you need science fiction around black holes
read Bobo's Star by Glenn Chandler

Star trek, Stargate series has lot of literature around black holes.

Check this too..

If I hadn't been a player, I
would have become an
astronomer. Why?
Supermassive Black Holes.

-Hugh Heff (Playboy Mansion)

:lol:

So, GT, does this HOLE's have anything common with "glory holes" as well?

:lol: :lol: :lol:

[fallenzeraphine]

:lol:

So, GT, does this HOLE's have anything common with "glory holes" as well?

:lol: :lol: :lol:

dont be a A-hole here ok, this is a thread where ppl talk so they can learn something, move ur small talks to some other thread, read this threads rules if ur brain doesnt compute what im saying.

[Nash_Node]

dont be a A-hole here ok, this is a thread where ppl talk so they can learn something, move ur small talks to some other thread, read this threads rules if ur brain doesnt compute what im saying.

OH!! common man :lol:

I was making a small joke on GT !!

and it didn't involve you either :P

[fallenzeraphine]

OH!! common man :lol:

I was making a small joke on GT !!

and it didn't involve you either :P

its my damn thread so anything u post here involves me, and this is not the place to joke, this conversation is over.

[Nash_Node]

its my damn thread so anything u post here involves me, and this is not the place to joke, this conversation is over.

So does the forum rules also states the fact a owner is defined based on whether or not he/she opened it?

Or is that what your idle faggot ass brain "computed" all this time?

[Nash_Node]

AHA !

Now I see why you are interested in Black holes.

You got so much in common with it :p

EMPTY !

lolzzzz

[GTRZ]

So does the forum rules also states the fact a owner is defined based on whether or not he/she opened it?

Or is that what your idle faggot ass brain "computed" all this time?

http://www.elakiri.com/forum/showthread.php?t=72610

[GTRZ]

AHA !

Now I see why you are interested in Black holes.

You got so much in common with it :p

EMPTY !

lolzzzz

ready for sometime away from ElaKiri? read the Pro Section rules.

[Nash_Node]

http://www.elakiri.com/forum/showthread.php?t=72610

Apooo.. OK OK..

you Boring buggers.

I was just making a joke.

Ok.. me OUT of the thread

[Nash_Node]

ready for sometime away from ElaKiri? read the Pro Section rules.
Though I "know" the rules:P, and KNOWS that this against it. ...but I can't help but asking this Q

The quoted line from you

Is that a threat or a warning GT ?

[GTRZ]

Apooo.. OK OK..

you Boring buggers.

I was just making a joke.

Ok.. me OUT of the thread
Bro, Go to a fun thread or make your own thread and make jokes.
Don't hijack other people's threads. Now if we go out of topic now, there will be noway to recover again.

[GTRZ]

Though I "know" the rules:P, and KNOWS that this against it. ...but I can't help but asking this Q

The quoted line from you

Is that a threat or a warning GT ? You can take it as what ever you like. But end of the day there should be no thread hijacking. :yes:
Now if you want more discussion about this then PM me. Coz this is not the place to talk about elakiri rules.

[Nash_Node]

You can take it as what ever you like. But end of the day there should be no thread hijacking. :yes:
Now if you want more discussion about this then PM me. Coz this is not the place to talk about elakiri rules.

Smart move :lol:

Respect - (For the smart move)

and NO, i am not interested in talking about law. I come here to escape from it.

Let's run into each other somewhere else !! ..

Me off the thread.

[fallenzeraphine]

u r right.. I too cant think of any books or even short stories of clerk which relates to black holes..
well yes most of clerk's work don't evolve around black Holes, but in Carl Sagan's Contact the "Machine" uses worm holes created by several black holes to reach the designated alien space station, read that book its very interesting,

Professor Stephen Hawking and Professor Kip Throne are foremost experts in Black Holes and worm holes these days, read some of their papers it'll be very interesting.

[kosandpol]

Professor Stephen Hawking and Professor Kip Throne are foremost experts in Black Holes and worm holes these days, read some of their papers it'll be very interesting.

Rather not. The brain might go super nova and create a black hole in my head. :P

[fallenzeraphine]

Rather not. The brain might go super nova and create a black hole in my head. :P

haha no Stephen hawking published some very easy to understand books like "Brief history of time", "Black holes and Baby universes", "The Universe in a Nutshell"

[Deepthdh]

thankx man....
isn't a star turning into a black hole rather rare?
the neutron star needs to be at a certain mass for this to happen right???

[kosandpol]

thankx man....
isn't a star turning into a black hole rather rare?
the neutron star needs to be at a certain mass for this to happen right???
Not as rare as you think.
If a star goes super nova, then the result is a black hole. Of cause the star has to be a large one to go super nova. I think a start about 100 times larger than our sun can go super nova. Smaller sized stars will not go super nova, hence will not turn in to black holes.

[TDM]

wow,.,.machan this article is very very interesting.,.,i knew those stuff about black holes but i never herd of worm holes(not in the name and the thory). ...ela kiri machan..
thanX for the article.,,.,if you hav more please put those also.....:P:P:P:P:P:P:P:P:P

machan can you give me some other informations about the worm holes

[dilrasan]

Thx 4 The In4...

[Aragorn]

Wow...cool.thnx 4da info!!

[kosandpol]

wow,.,.machan this article is very very interesting.,.,i knew those stuff about black holes but i never herd of worm holes(not in the name and the thory). ...ela kiri machan..
thanX for the article.,,.,if you hav more please put those also.....:P:P:P:P:P:P:P:P:P

machan can you give me some other informations about the worm holes

Worm holes :
http://www.rickleephoto.com/blog/apple1.jpg

:lol::lol:

[jehan3]

ela thanx