Will Black Holes last forever?

Question

So a sun gets so big it's own gravity causes it to implode, making a black hole which proceeds to suck in everything else around it. Is it possible for black holes such as this to ever get 'full,' or will they go on sucking things in forever?

Answer 1

No, they don’t last forever. Stephen Hawking discovered that even when Black Holes “suck” on everything, they actually release particles at the same time.

The problem is that those particles are just that, particles (very small) and they are released at a very slow rate, so for a small Black Hole, it could take billions and even trillion years before it disappears. Lets not even talk about Super Massive Black Holes.

Hawking discoveries have transformed the scientific society way of thinking, and given us a new light on how the Cosmos works.

Answer 2

A sun uses up all its fusion fuel whose radiation pressure serves to counteract grav collapse. So your sun will 'shrink'.The Schwartzchild radius only guarantees a black hole event if the neutron spacing within this volume is such that the HU principle (delta(x)*delta(p)=h/4pi) leads to a neutron 'gas' pressure (P=N*M*v^2/3) which is not sufficient to counteract the gravitational field force. (where p=m*v for neutrons). I get a figure of about 1.45 solar masses, rather than the lower 1.38 solar mass limit quoted. Anyway black holes have temperature due to asymnetric pair production capture in the vicinity of the event horizon. And because of this geometry, large black holes radiate at much lower temperatures. Much smaller black holes would radiate at higher temperatures and 'evapourate' within the cosmic timescale. I think that matter in the universe on average has sufficient Ek to avoid capture even from super-super-massive black holes indefinitely, since colliding galaxies containing these SMBH's are an increasingly rare event in a mature expanding universe,so there is a vanishingly small probability of all the matter being engulfed.

Answer 3

There is a mechanism (called 'Hawking Radiation' after Stephen Hawking, who discovered it) by which it is possible for a black hole to lose mass. But, so far, we simply don't know. It's only been just barely 100 years since the idea of 'Black Holes' came to be accepted and just a little over 50 years since the first one was actually discovered.

Doug

Answer 4

The largest black holes (usually found in the centre of galaxies) will disappear in a blaze of Hawking radiation about 10 to the power 120 years from now - a VERY long time!

Answer 5

an uncomplicated way 2 seem on the evaporation mechanism is that the quantum vacuum creates debris/antiparticles each and every of the time making use of 'borrowed means'. The Heisenberg uncertainty priciple helps it to 'borrow' an quantity of means E for time t, the place E*t=h/2pi (h=plank const)..this creates a particle antiparticle pair so as that could charge, momentum etc are conserved. regularly the pair annihilate so means is conserved too. in the location of a black hollow between the debris could be captured, at the same time as the different escapes..this represents a internet leakage of mass/means from the black hollow. subsequently a black hollow has a temperature and extremely slowly loses mass/means

Answer 6

It only sucks in things within it's reach. Eventually there is nothing left around it. In the mean time it's emitting radiation. Over the course of a trillion years or so it will eventually evaporate. Below is a BH FAQ.

Answer 7

if it takes trillions of years for a blackhole to evaporate via hawking radiation, and since the age of the universe is ~13.7 then no black holes have complety evaporated in our universe.

This is similar to the black dwarf theory.

Answer 8

Black holes do not last forever. They eventually fizzle.

http://www.wonderquest.com/black-holes.htm

Answer 9

after they suck everything, they r not gonna suck anymore, so they're going to die

Answer 10

If I told you they last forever would it ruin everything?