Hello everyone I thought of sharing this Topic with you "BLACK HOLES IN SPACE", I was facsinated with this tremendous force exisiting in the space eversince I saw this documentary on one of the TV channels. I always get caught with technical words when I read about Black holes on the Internet, I hope to have some clear simple understanding of the topic by our moderaters and owners of this community and also genius members who would want to contribute to this topic. I look forward for your comments.

Heres something I am sharing with you guys what I read browsing the Ineternet sites about Black Holes in Space.


What is a Black Hole in Space?

A black hole is an object that is so compact (in other words, has enough mass in a small enough volume) that its gravitational force is strong enough to prevent light or anything else from escaping.

They form whenever massive but otherwise normal star die. We cannot see Black Holes, but we can detect materials falling into black holes and being attracted by black holes, In this way astromers have identified and mesured the mass of many black hoels in the Universe through careful observation of the sky. We now know that our Universe is quite literally filled with billions of black holes.

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A black hole is an (almost invisible) body in space, created most likely from a collapsed red super giant star, that is so dense that neither light nor matter can escape its gravitational pull.

Inside a star there is a constant battle between inward pressure from gravity, and outward pressure from heat. If you were to throw an unopened can of soda into a fire, the beverage would expand from the heat and explode. This is the same principle at work when a star is burning, its heat is generating great outward pressure but this constant explosion is matched by gravity that is equally strong, thus a star maintains its shape and size.

(Part II)

When a star nears the end of its life it cools off slowly and the outwards pressure grows weaker and weaker as the temperature of the star drops. When the outward pressure from the heat is nearly gone, the inward pressure of gravity still remains and is determined by the size of the star. It is theorized that when a star roughly ten times the size of our Sun nears the end of its life, it shrinks as its own gravity slowly pulls it in, but as it becomes more and more dense the gravity becomes stronger.

The gravity becomes so intense that not even light can escape it. If you have ever watched water swirling down a drain, then you have a pretty good idea what happens as a black hole pulls things in. As matter and light approach the vicinity of a black hole they are slowly drawn in. If they are not headed straight for the spacial anomaly then they are taken into a violent and unstable orbit around the black hole until finally the orbit falls apart and it is sucked down by the immense gravity.

The size of the black hole is determined by the mass of the collapsed star. The critical radius of a non-rotating black hole is called the Schwarzschild radius, called after the German astronomer Karl Schwarzschild (1873-1916) who investigated the problem in 1916 on the basis of Einstein's theory of general relativity. According to general relativity the gravitation of a black hole bends space and time to such an extent where they broken down into a dimensionless body of infinite density.

The boundary around the collapsed star having this radius is referred to as the 'event horizon'. Anything, whether it be light or matter passing this boundary will be forever lost within the black hole with no chance of escape. What happens beyond the event horizon nobody can tell, because all the laws of physics break down and no longer apply. There are many theories but little proof to support them.

(Part III)

Black holes can't be seen, as they do not emit any electromagnetic radiation. But they can be detected because of their affects on the surrounding stars.

Evidence of black holes is mounting, and it is now believed that most galaxies of a large enough size and possibly our own have a black hole at their centre.

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Guys do comment on this Topic, heres also a web-site if you wanna read exclusively on Black Holes in Space.

http://cosmology.berkeley.edu/Education/BHfaq.html

Is travel to another Universe a possibility through Black Holes?

(Part IV)

The idea that spaceships might zip across the universe using black holes as a high-speed portal is a well-worn sci-fi cliché.

But the consensus among scientists of late is that black holes are so destructive, spaceships would be torn to subatomic bits if they tried such a thing.

"One possibility is that black holes may allow us to travel to very remote places in the universe, or another universe entirely," "It depends on the topology of the universe, which we do not know very well...., but maybe in 1,000 years from now, maybe it would be simpler."

Black holes may be doorways to tunnels, or shortcuts, between distant points of the universe, different points in time or even parallel universes.

The interiors of black holes are so infinitely dense that they exert massively destructive, "tide-like" distortions on approaching objects, ripping them into their constituent subatomic particles.

In fact, this infinitely dense interior gives black holes their potential for space and time travel. Inside a black hole, the very fabric of the universe is collapsed into a point of infinite curvature -- known as a "space-time singularity," where the laws of physics no longer apply.

Some black holes may not be as destructive as others. Under certain circumstances, black holes may have "Cauchy horizon singularities," which may not be destructive but still act as openings between distant points of the universe.

Under certain conditions, hybrid singularities may exist. These hybrid singularities are composed of a strong sector, which is destructive, and a weak sector, which may not be. Any spacecraft entering the weak sector could possibly pass through without being damaged.

(Part V)

It's all theoretical, but the possibility of a weaker singularity doesn't rule out the potential of using black holes for interstellar travel.

"At the moment, we don’t have compelling evidence that this kind of hyperspace travel is disallowed," "It doesn't mean, of course, it is allowed, but scientist don’t have compelling evidence to the contrary."

Even if the idea of interstellar space travel through black holes is possible, traveling to a suitable black hole to try it out would be a problem.

A scientist said that the black hole at the center of the Milky Way may be a candidate, but it's 26,000 light years away. Traveling at near the speed of light -- the upper limit for an interstellar excursion -- the trip would take nearly 30,000 years.

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Guys please visit this web site for a clear visual understanding of Black Holes.

http://hubblesite.org/explore_astronomy/black_holes/home.html

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