Blackholes?

Question

How do they form?Do they die? Is there a possibility that it can destroy Earth?

Answer 1

when a star dies..it foems a small but very dense pulsar...which rotates at a very high speeds...this contains only pure nutrons and protons....which are very dense....
now this pulsar keeps on collasping in to itself and forms and infinite point....which cannot be seen due tot he massive gravitational pull of this dense material....from this blacck hole even light is bend and sucked onto this infinite point...
black holes cannot die...because according to science...any matter collasping onto itself will gather more matter from nearby space and still collasp and compress antill infinity...
as time passses black holes will become more denser and powerful...
black holes aere usually formed in the center of a galaxy....normally a spiral one...
it is presumed that milky way has a black hole but because of clouds and other dense star...we cannot even see the sucxking of light at the center...
and as we are at the tip of one of the spiral extension....it is impossible to suck earth into the black hole in the milky way...
sun may become a black hole only when it dies and ...in this process...its already going to destroy all the planets we have ..
dont be afraid...we wont live nor even our successors when earth drifts in to a black hole.!!

Answer 2

A black hole forms when a neutron star (a star the size of an earth city made up of nothing but atomic nucelei) has so much mass that even the neutrons can't hold the star up against the immense gravitational pressure. When that happens the escape velocity of the star, the speed something would have to travel at in order to go into orbit around the star, exceeds 186,000 miles per second, the speed of light. By comparison, the escape velocity for the earth is only about 7.5 miles per second. What this means is that light can't escape the gravitational pull and therefore we can't see the neutron star anymore because it is no longer emitting light. The star, theoretically, continues to collapse into a "singularity" - a center that has infinite mass and infinite energy. Nothing could survive under such extremes so it's safe to say we'll never directly see what is going on in the center of a black hole.

Do they die? According to Stephen Hawking, they can radiate virtual particle pairs that failed to destroy each other at the event horizon (the edge of the black hole). This process takes more time than the universe is old, and no one has ever seen a black hole die. It would be quite an explosion. The death of a black hole may be what triggered the birth of the Big Bang, but it's all speculation.

There is no black hole near the earth, although there is at least one supermassive black hole at the center of our galaxy, about 70,000 light years away. The earth, or more precisely, the sun, orbits the center of the galaxy so there is no chance of the earth ever falling toward the galactic core. A black hole is not a predator, it's like any other gravitational body. If the earth came near a black hole, it would orbit around it. From time to time, however, especially in the core of a galaxy where stars are much closer together, black holes get a meal of a hapless binary star system whose orbits took it too close to the black hole's event horizon. When black holes are "feeding" you can visibly tell there's a black hole there because of highly ionized matter circling around it at near light speed like water swirling down a drain. It looks like a disk so it is aptly named an "accretion disk." Perpendicular to the disk are twin jets of high energy matter streaming out of the black hole at near light speed, like light sabers many trillions of miles long. So it's quite a show. When the black hole runs out of stellar matter to feed on, it becomes quiescent (goes to sleep) for maybe hundreds of millions of years, until something else comes along. During that time you wouldn't even know it was there.

Answer 3

If scientists could figure out what to do with a maximum mass neutron star I am sure they would abandon the black hole.
A neutron star is a 1.5 to 2 solar mass star.with a diameter of about 10km.
Our sun is a one solar mass star with a very nebulous atmosphere.
If the sun approched a neutron star it would tear matter from the surface and eventually consume it,but,when a neutron star reaches a certain mass the forces that maintain it as a neutron star are overcome and it must collapse more.
A black hole would be an ideal entity to solve this problem.
But a black hole has characteristics that appear to portray it as a theoretical,non viable entity.
When a white dwarf collapses to a neutron star,the space it contains that specifies what it is,is displaced resulting in a neutron star.
The neutrons are not in contact with each other,they are separated by space.
This space is maintained by degenerate neutron pressure.The space allows the neutron star to exist.
Without space the neutrons will revert to a quantum state in less than one ten-thousands of a second and become pure energy according to E=MC squared.
The burst of gamma rays would explode outward destroying the nearby sun and leaving an area of low density space containing no matter.
The low density space represents the end stage of an evolving universe.
An analysis of a black hole leaves it as a very poor candidate for a place in an evolving universe!

Answer 4

You don't have to worry about the earth getting sucked into a black hole there is nothing anywhere near us that is large enough to create a black hole Once a medium size star (such as our Sun) has reached the red giant phase, its outer layers continue to expand, It is said to expand to the earths orbit another words it could gulp the earth up but even if it did not it would melt the earths surface killing everything this is supposed to happen in 4 million or billion years either way it's a long a s s time from now like half the suns life is over anyway the core contracts inward, and helium atoms in the core fuse together to form carbon. This fusion releases energy and the star gets a temporary reprieve. However, in a Sun-sized star, this process might only take a few minutes! The atomic structure of carbon is too strong to be further compressed by the mass of the surrounding material. The core is stabilized and the end is near.

The star will now begin to shed its outer layers as a diffuse cloud called a planetary nebula. Eventually, only about 20% of the star’s initial mass remains and the star spends the rest of its days cooling and shrinking until it is only a few thousand miles in diameter. It has become a white dwarf. White dwarfs are stable because the inward pull of gravity is balanced by the electrons in the core of the star repulsing each other. With no fuel left to burn, the hot star radiates its remaining heat into the coldness of space for many billions of years. In the end, it will just sit in space as a cold dark mass sometimes referred to as a black dwarf.



OK HERE IT IS IT IS A GRAVITY HOLE SO STRONG THAT NOTHING CAN EsCAPE IT BUT RADIATION IT IS SAID BY SCIENTIST MUCH SMARTER THEN ME THAT EVERYTHING
IN THE UNIVERSE ALL THE ENERGY THATS THERE WILL DIE DOWN AND EVERYTHING WILL AT SOME POINT AND TIME JUST STOP JUST AS IT STARTED SO YES WE THINK THEY WILL DIE OUT AND IT IS ALSO SAID THAT THESE BLACK HOLES AND DARK MATTER FUNCTION LIKE DUCK TAPE HOLDING EVERYTHING TOGETHER

Black holes are the evolutionary endpoints of stars at least 10 to 15 times as massive as the Sun. If a star that massive or larger undergoes a supernova explosion, it may leave behind a fairly massive burned out stellar remnant. With no outward forces to oppose gravitational forces,

the remnant will collapse in on itself. The star eventually collapses to the point of zero volume and infinite density, creating what is known as a " singularity ". As the density increases, the path of light rays emitted from the star are bent and eventually wrapped irrevocably around the star. Any emitted photons are trapped into an orbit by the intense gravitational field; they will never leave it. Because no light escapes after the star reaches this infinite density, it is called a black hole.
But contrary to popular myth, a black hole is not a cosmic vacuum cleaner. If our Sun was suddenly replaced with a black hole of the same mass, the earth's orbit around the Sun would be unchanged. (Of course the Earth's temperature would change, and there would be no solar wind or solar magnetic storms affecting us.) To be "sucked" into a black hole, one has to cross inside the Schwarzschild radius. At this radius, the escape speed is equal to the speed of light, and once light passes through, even it cannot escape.

The Schwarzschild radius can be calculated using the equation for escape speed.


vesc = (2GM/R)1/2

For photons, or objects with no mass, we can substitute c (the speed of light) for Vesc and find the Schwarzschild radius, R, to be

R = 2GM/c2
If the Sun was replaced with a black hole that had the same mass as the Sun, the Schwarzschild radius would be 3 km (compared to the Sun's radius of nearly 700,000 km). Hence the Earth would have to get very close to get sucked into a black hole at the center of our solar system

for more info check these recources

http://imagine.gsfc.nasa.gov/docs/teachers/lifecycles/LC_main3.html

http://imagine.gsfc.nasa.gov/docs/science/know_l2/black_holes.html

There is quite a bit of black hole theory out there. For more information on it, try these books:


Black Holes and Warped Spacetime - William J. Kaufmann, III
Lonely Hearts of the Cosmos - Dennis Overbye
Black Holes and Time Warps, Einstein's Outrageous Legacy - Kip S. Thorne
The Mathematical Theory of Black Holes - S. Chandrasekhar
Black Holes and Baby Universes and other Essays - Stephen Hawking
Universe - William J. Kaufmann, III
Black Holes and the Universe - Igor Novikov

Answer 5

this is a probability that there are blackholes wandering around between the celebrities of the Milky way, and that one in each of them might collide with the Earth or solar and destroy it. Such activities could be incredibly uncommon, whether, because of the fact they are incredibly lively and if this form of component had befell to any of the trillion different stars in the Milky way in the previous few a protracted time, we probable could have seen it. all the black holes that we actually comprehend approximately (in the galactic center, Cygnus X-one million) are so a techniques away that any interplay between us and them is 1000's of tens of millions of years sooner or later, and not likely even then.

Answer 6

easiest way to answer your question is to say black holes form when mass collapses in on itself and nobody knows if they die or not, and yes a black hold could not only destroy the earth but the entire solar system

Answer 7

Black holes are stars that have collapsed into them selves creating a massive gravity well that sucks in everything around it, even light, and yes we would be in big trouble if one was to get near earth. Fortunately no black holes have been found (to my knowledge) anywhere in our solar system, so the Chance's of one sucking up our planet are pretty low.
Hope this answered your question

Answer 8

Blackholes form when stars explode as a supernova and form into a blackhole, white dwarf, black dwarf or a pulsar!

Blackholes might die if a larger blach hole collides with each other sucking each other. They might became 1 big black hole too!!

Answer 9

There is NO black hole anywhere near Earth. In order for a black hole to form you need a massive dying star. There is no star of that size anywhere near. The sun is not large enough, and the next nearest star, Proxima Centauri is four light years away. It too is not large enough.

Answer 10

a black hole forms when a star that has the mass bigger or equal to the mass of the sun dies. it kind of inverts in itself and it creates what we call a black hole

event horizon is the surface of the black hole. once you cross the event horizon, nothing escapes, not even light.

a black hole cannot destroy our earth because we are very very very VERY far from the nearest black hole.

ps, if an astronout were to cross the event horizon (not possible in any way shape or form, as i've explained above), he would elongate like a spaghetti!

pps, no one has ever seen (directly a black hole).