During most of its lifetime, the star will generate heat at its center by converting oxygen into helium. The energy released will create sufficient pressure to support the star against its own gravity, giving rise to an object with a radius about fives times the radius of the sun. The escape velocity from the surface of such a star would be about a thousand kilometers per second. When a star had exhausted its nuclear fuel, there would be nothing to maintain the outward pressure and the star would begin to collapse because of its own gravity. As the star shrank, the gravitational field at the surface would become stronger and the escape velocity would increase. By the time the radius had got down to thirty kilometers, the escape velocity would have increased to 300,000 kilometers per second, the velocity of light. After that time any light emitted from the star would not be able to escape, but would be dragged back by the gravitational field. According to the special theory of relativity, nothing can travel faster than light, so that if light cannot escape, nothing else can either. The result would be a black hole. The boundary of the black hole is called the event horizon. .
What exactly is the event horizon? The essence of a black hole is the event horizon, the point of no return. At the event horizon, something would have to travel at .
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the speed of light to escape from the black hole. Since nothing can travel that fast, nothing can return to the outside world once it has stepped over this invisible boundary. .
The black hole affects space and time in two ways. Its gravity distorts and hinders the passage of signals from objects near it as they try to communicate with the outside world, and greatly distorts the passage of time. The event horizon is the edge of a black hole. Once past it, one is inside the hole, caught in its grip forever. .
The horizon is a spherical boundary whose radius depends on the mass of the black hole.
A black hole is a place where the curvature is so strong that a black hole is formed. ... A typical mass for such a black hole would be about 10 times the mass of the Sun, or about 10^{31} kilograms. The black hole's is surrounded by the event horizon whose size depends on the mass of the black hole. ... Works Cited "Black Holes." ... "Black Holes." ...
Most Physicists like to tell us that black holes are bald or that they have no hair. Upon translation what they mean is, if we were able to observe black holes each one would look exactly the same: pitch black as can be, and in the shape of flawless spheres. ... Unlike the colossal black holes that already exist, the donut-holes made by humans would not be much bigger than the nucleus of a single atom. ... An ant walking from A to B in this diagram would take approximately 10 seconds. ... At the point of maximum oscillation the black hole will become highly unstable and dangerous. ...
That mystery happens to be that of the ever elusive, black hole. ... The black hole's surface is known as the event horizon. ... A spherically symmetric black hole with a point electric charge has the same essential features as a rotating black hole. ... In order to understand what exactly a black hole is, we must first take a look at the basis for the cause of a black hole. ... Such spinning black holes are known as Kerr black holes. ...
The black hole's surface is known as the event horizon. ... A spherically symmetric black hole with a point electric charge has the same essential features as a rotating black hole. ... In order to understand what exactly a black hole is, we must first take a look at the basis for the cause of a black hole. ... Such spinning black holes are known as Kerr black holes. ... Black hole electrodynamics is the theory of electrodynamics outside a black hole. ...
A spherically symmetric black hole with a point electric charge has the same essential features as a rotating black hole. ... In order to understand what exactly a black hole is, we must first take a look at the basis for the cause of a black hole. ... Such spinning black holes are known as Kerr black holes. ... Black hole electrodynamics is the theory of electrodynamics outside a black hole. ... Far from the black hole, at infinity, the black hole electric field is that of a point charge. ...
There are two types of black holes, one being the stellar mass black holes "Which means that their mass is comparable to that of a star " and supermassive black holes (SMBH's), which "Are millions or billions of times the Sun's mass and are way to massive to have formed in the explosion of a single star"" (e.g. ... Also the size of the black holes event horizon can be calculated using Schwarzschild radius. The size (radius) of the black hole=mass of the black hole X (2G(gravitational constant)/ c^2(speed of light)). ... Black holes consume all matter around them including light. ....
Black holes have been said to be the key to traveling into the past. A black hole is a star that is sufficiently massive and compact creating a strong gravitational field that even light could not escape. ... (Hawking pg. 94) Black holes gravitational force is said to be great that it even pulls time inward, slowing time on the other side. There is a problem when traveling into a black hole. ... (Gribbin pg. 15) There is a process that might be able to work in stabilizing a black hole. ...
At this point in time, astronomists have yet to actually see a black hole. So how do they know that black holes do in fact exist? ... Scientists today call such an object a black hole. ... Since a black hole is a region of space from which nothing can escape, the time-reversed version of a black hole is a region of space into which nothing can fall. In fact, just as a black hole can only suck things in, a white hole can only spit things out. ...
Astronomers believe that Machos are made up primarily of red dwarf stars and black holes. ... Black Holes on the other hand have an over abundance of matter. ... Since the black hole is so dense, nothing that comes close to it can escape it's immense gravitational field, including light. For this reason, Black Holes are truly black. ... It occurs when a red dwarf or black hole passes between a star or galaxy and an observer on Earth. ...