Blackhole Definition and 125 Threads

I have a thought experiment for anyone interested. All replies welcome: Imagine if you will, a large spherical body e.g. a moon, about the surface of which are placed many large thermonuclear devices. Deep inside the moon sits an intrepid/foolish experimental physicist. When the the devices...

When a particle fall past the event horizon, is it possible to escape via quantum tunnelling?

What is inside the black hole? It is a tunnel for other universe or anything else. what happen to us when we go inside the black hole?

Nasa team has solved a great mystery:http://www.nasa.gov/mission_pages/swift/bursts/short_burst_oct5.html

Help me out. I understand that the speed of light is thought of as the maximum speed in the universe. However, if the gravity of a black hole can suck in light, wouldn't that mean that the gravity of a black hole could accelerate matter until it surpassed the speed of light?

hi i have few unclear things but I'm not sure if this is the correct thread. 1.can anyone explain me how does a black hole deacy. please include no mathematics and only logic. 2.is gravity wave something like electromagnetic wave transmitted by gravitons instead of a photon?but i heard; by...

Hi there. I just have a question about black holes. Would a black hole be able to suck-in another black hole?

Hello everyone! I'm a student in the UK who just finished my GCSE's and I am very interesting in physics particularly quantum physics, though i have little knowledge of it. So a black hole is also called a "quantum singularity"? And it is an object with near infite mass and little/no volume...

If there a massive black hole at the center of each galaxy then; near the center of our galaxy, stars should be revolving the BH at very high speeds, hence we should be able to note their revolutions around the BH in months, days or even hours. And hence we should also be able to see some of...

OK guys I know that one of the ways that black hole radiation is detected is by detecting some sort of radiation. My question is... is this radiation or whatever released at a point were light cannot escape from the black hole? I mean the escape velocity from black holes is immensly greater...

What is the minimum size of the event horizon of a black hole? Obviously you need some certain amount of mass for a black hole, because I don't get sucked into my chair, to overcome the other forces. I just had an image of a tiny black orb hovering in front of me, and wondered what would...

Martin Bojowald got rid of the Bigbang singularity in 2001 while at Penn State----on postdoc working for Ashtekar. Now he is at the Albert Einstein Institute in Germany. This year he has been working on getting rid of the Blackhole singularity and has posted one or two preliminary papers...

I just finished writing a book, and I am outta ideas for a good title... I thought about calling it Event Horizon, but a movie (a very bad movie) with the same name came out years ago... anybody got any ideas of a title having to do with a black hole? thank you :smile:

It was in response to this https://www.physicsforums.com/showthread.php?goto=newpost&t=41878 The biggest gap of them all and it is found in the most unlikely place? http://www.sukidog.com/jpierre/strings/mplanck.gif High energy particles have extremely small wavelengths and can probe...

May be absorbing 3-D information, but they can only emit 2-D information. According to Hawking recent expose on 'Information Paradox', the result conforms to the reality that Blackholes at all Galactic cores are really Nature's Parametric Low Energy Dimensional Down-Converters. For every...

The biggest gap of them all and it is found in the most unlikely place? http://www.sukidog.com/jpierre/strings/mplanck.gif With Marcus's introduction to Words of Stephen Hawking and "predictions" what might we find from such a talk? We know well this could all be dismissed very easily...

I am not a physicist but with a very big passion for the subject. I might not be able to solve your equations but i love the mind games associated with BH. Having said that, let me move on to my observation: A kerr BH has two event horizons- The outer event horizon marks the boundary within...

I'm trying to find some recent work describing the fate of a star in orbit around a BH. Thanks for any help.

Is the amount of information taken in by a Blackhole, proportional to the amount given out?

U see, everything near the black hole or within event horizon will be attract towards the black hole, even light cannot escape it. But since light is also puuled inside, imagine u are standing on the black hole looking outward, will u see the light? Or will the light change to mass?

Hello, I was wondering why an observer looking at an object entering the event horizon of a black hole would never really see it go through? Versus a person actually experiencing the ride.

I haven't understood this concept properly... When a star becomes a black hole and then eventually reaches singularity, does it shrink the space-time it previously occupied..along with it's own contraction? or is the previously occupied spacetime available for other particles to fillup ?

I've been reading some books on Galactic Structures and Galactic Evolutions, evidence from rotation curves of stars near the centre of our Milky Way and also M31 suggest that there is a black hole in the centre. But is this true for all galaxies regardless of their Hubble Type? is there a...

Hi All, Blackholes will curve the space-time in a way so that even particles moving with speed of light are trapped. It's presence is detected by the gravitational force it exerts. So if there were particles like gravitons which would defenitely travel less than or equal to 'c', those also...

Does a black hole have a wavefunction?